Edit Profile (opens in new tab) Qi, Liqun Co-Author Distance Author ID: qi.liqun Published as: Qi, Liqun; Qi, L.; Qi, Li-qun; Qi, L. Q.; Qi, Liquin; Qi, Li-Qun; Qi, Li Qun; Qi, LiQun more...less Homepage: http://www.polyu.edu.hk/ama/staff/new/QiLQ.htm External Links: MGP · Wikidata · Google Scholar · ResearchGate · dblp · GND · IdRef Documents Indexed: 440 Publications since 1979, including 3 Books and 54 Additional arXiv Preprints 14 Contributions as Editor Co-Authors: 196 Co-Authors with 412 Joint Publications 6,905 Co-Co-Authors all top 5 Co-Authors 40 single-authored 42 Ling, Chen 27 Chen, Yannan 27 Luo, ZiYan 26 Zhang, Xinzhen 24 Zhou, Guanglu 23 Hu, ShengLong 21 Sun, Defeng 20 Huang, Zheng-Hai 19 Song, Yisheng 17 Wei, Yimin 15 Li, Guoyin 15 Yu, Gaohang 13 Chen, Haibin 13 Tong, Xiaojiao 12 Qi, Houduo 11 Chen, Xiaojun 11 He, Hongjin 11 Wei, Zengxin 11 Wu, Soon-Yi 11 Xu, Yi 10 Chen, Zhongming 10 Sun, Wenyu 10 Wang, Yiju 9 Birge, John R. 9 Cui, Chunfeng 9 Ding, Weiyang 9 Li, Donghui 9 Xu, Yanwei 9 Yan, Hong 9 Yin, Hongxia 9 Zhang, Liping 8 Che, Maolin 8 Yang, Yufei 7 Fukushima, Masao 7 Jiang, Houyuan 7 Wang, Qun 6 Han, Deren 6 Liu, Jinjie 6 Shao, Jiayu 6 Teo, Kok Lay 6 Xu, Changqing 5 Liao, Li-Zhi 5 Wang, Fei 5 Wu, Ed Xuekui 5 Yang, Qingzhi 5 Yuan, Xiying 5 Zou, Wennan 4 Caccetta, Louis 4 Dontchev, Asen L. 4 Ni, Qin 4 Ouyang, Chen 4 Sun, Jie 4 Womersley, Robert S. 4 Wu, Felix F. 4 Ye, Yinyu 4 Zhang, Jianzhong 3 Chang, Jingya 3 Chen, Zhibing 3 Miao, Yun 3 Ming, Zhenyu 3 Ng, Michael Kwok-Po 3 Ni, Guyan 3 Polak, Elijah (Lucien) 3 Wang, Qingwen 3 Xie, Jinshan 3 Yang, Xiaoqi 3 Yang, Yuning 2 Balas, Egon 2 Cai, Xiaohao 2 Chang, Kung-Ching 2 Chen, Jinhai 2 Chi, Zongtao 2 Dai, Hui-Hui 2 Gwan, Geena 2 Jákli, Antal 2 Kang, Liying 2 Kelley, Carl T. 2 Li, Yaotang 2 Liu, Lele 2 Mifflin, Robert 2 Mo, Jiangtao 2 Nashed, Zuhair 2 Pan, Chenjian 2 Pang, Jong-Shi 2 Toint, Philippe Louis 2 Tseng, Paul 2 Wan, Shaochun 2 Wang, Xiangke 2 Wang, Yong 2 Xiang, Hua 2 Xiu, Naihua 2 Zhang, Guofeng 2 Zhang, Tan 1 Alexander, David M. 1 Alqahtani, Mohammed S. 1 Bai, Minru 1 Bai, Zhengjian 1 Bakshi, Mayank 1 Bohnet-Waldraff, Fabian 1 Bomze, Immanuel M. ...and 96 more Co-Authors all top 5 Serials 31 Journal of Optimization Theory and Applications 21 Linear Algebra and its Applications 20 Journal of Global Optimization 20 Computational Optimization and Applications 19 SIAM Journal on Optimization 17 Numerical Linear Algebra with Applications 15 Mathematical Programming. Series A. Series B 14 Journal of Computational and Applied Mathematics 13 Frontiers of Mathematics in China 12 Communications in Mathematical Sciences 11 SIAM Journal on Matrix Analysis and Applications 10 Journal of Industrial and Management Optimization 9 Applied Mathematics and Computation 8 Mathematics of Operations Research 8 Pacific Journal of Optimization 7 Journal of Mathematical Analysis and Applications 7 Numerical Functional Analysis and Optimization 7 Optimization Methods & Software 6 Linear and Multilinear Algebra 6 Journal of Scientific Computing 5 SIAM Journal on Numerical Analysis 5 Journal of Combinatorial Optimization 4 Mathematics of Computation 4 Asia-Pacific Journal of Operational Research 4 Annals of Operations Research 4 Optimization Letters 4 Science China. Mathematics 3 Discrete Applied Mathematics 3 Numerische Mathematik 3 SIAM Journal on Control and Optimization 3 Numerical Mathematics 3 Operations Research Letters 3 Optimization 3 Journal of Symbolic Computation 3 Journal of the Operations Research Society of China 3 Communications on Applied Mathematics and Computation 2 Applied Mathematics and Optimization 2 IEEE Transactions on Automatic Control 2 Mathematical Programming Study 2 Nonlinear Analysis. Theory, Methods & Applications. Series A: Theory and Methods 2 Applied Mathematics Letters 2 Journal of Mathematical Imaging and Vision 2 SIAM Journal on Scientific Computing 2 Journal of Convex Analysis 2 Journal of Nonlinear and Convex Analysis 2 Applied Optimization 2 SIAM Journal on Imaging Sciences 2 Numerical Mathematics: Theory, Methods and Applications 2 Journal of Suzhou University of Science and Technology. Natural Science Edition 2 Numerical Algebra, Control and Optimization 2 Nonlinear Analysis. Theory, Methods & Applications 2 Minimax Theory and its Applications 1 International Journal of Theoretical Physics 1 Journal of Mathematical Physics 1 Physics Letters. A 1 BIT 1 Computing 1 Management Science 1 Journal of Computational Mathematics 1 Constructive Approximation 1 Journal of Tsinghua University. Science and Technology 1 Signal Processing 1 IEEE Transactions on Signal Processing 1 Numerical Algorithms 1 International Journal of Computer Mathematics 1 Journal of Elasticity 1 The Australasian Journal of Combinatorics 1 Numerical Mathematics 1 Mathematics and Mechanics of Solids 1 Journal of Inequalities and Applications 1 Optimization and Engineering 1 Analysis and Applications (Singapore) 1 International Journal of Numerical Analysis and Modeling 1 Advances in Mechanics and Mathematics 1 Advanced Modeling and Optimization 1 Journal of Physics A: Mathematical and Theoretical 1 Inverse Problems and Imaging 1 Communications in Mathematical Research 1 Scientia Sinica. Mathematica 1 AMM. Applied Mathematics and Mechanics. (English Edition) 1 Annals of Applied Mathematics 1 Other Titles in Applied Mathematics 1 Pure and Applied Functional Analysis all top 5 Fields 221 Operations research, mathematical programming (90-XX) 158 Linear and multilinear algebra; matrix theory (15-XX) 156 Numerical analysis (65-XX) 52 Calculus of variations and optimal control; optimization (49-XX) 31 Combinatorics (05-XX) 15 General and overarching topics; collections (00-XX) 14 Differential geometry (53-XX) 9 Real functions (26-XX) 9 Operator theory (47-XX) 9 Computer science (68-XX) 9 Quantum theory (81-XX) 9 Game theory, economics, finance, and other social and behavioral sciences (91-XX) 7 Algebraic geometry (14-XX) 7 Approximations and expansions (41-XX) 7 Mechanics of deformable solids (74-XX) 6 Probability theory and stochastic processes (60-XX) 5 Functional analysis (46-XX) 5 Information and communication theory, circuits (94-XX) 4 Convex and discrete geometry (52-XX) 4 Biology and other natural sciences (92-XX) 3 Commutative algebra (13-XX) 3 Ordinary differential equations (34-XX) 2 Functions of a complex variable (30-XX) 2 Partial differential equations (35-XX) 2 Statistics (62-XX) 2 Mechanics of particles and systems (70-XX) 2 Optics, electromagnetic theory (78-XX) 2 Relativity and gravitational theory (83-XX) 2 Systems theory; control (93-XX) 1 Field theory and polynomials (12-XX) 1 Associative rings and algebras (16-XX) 1 Nonassociative rings and algebras (17-XX) 1 Dynamical systems and ergodic theory (37-XX) 1 Integral transforms, operational calculus (44-XX) 1 Global analysis, analysis on manifolds (58-XX) 1 Statistical mechanics, structure of matter (82-XX) Publications by Year all cited Publications top 5 cited Publications Citations contained in zbMATH Open 350 Publications have been cited 10,872 times in 3,635 Documents Cited by ▼ Year ▼ Eigenvalues of a real supersymmetric tensor. Zbl 1125.15014 Qi, Liqun 768 2005 A nonsmooth version of Newton’s method. Zbl 0780.90090 Qi, Liqun; Sun, Jie 728 1993 Convergence analysis of some algorithms for solving nonsmooth equations. Zbl 0776.65037 Qi, Liqun 376 1993 Tensor analysis. Spectral theory and special tensors. Zbl 1370.15001 Qi, Liqun; Luo, Ziyan 249 2017 A new look at smoothing Newton methods for nonlinear complementarity problems and box constrained variational inequalities. Zbl 0989.90124 Qi, Liqun; Sun, Defeng; Zhou, Guanglu 210 2000 Finding the largest eigenvalue of a nonnegative tensor. Zbl 1197.65036 Ng, Michael; Qi, Liqun; Zhou, Guanglu 206 2010 \(M\)-tensors and nonsingular \(M\)-tensors. Zbl 1283.15074 Ding, Weiyang; Qi, Liqun; Wei, Yimin 174 2013 \(M\)-tensors and some applications. Zbl 1307.15034 Zhang, Liping; Qi, Liqun; Zhou, Guanglu 170 2014 Nonsmooth equations: Motivation and algorithms. Zbl 0784.90082 Pang, Jong-Shi; Qi, Liqun 164 1993 Symmetric nonnegative tensors and copositive tensors. Zbl 1281.15025 Qi, Liqun 148 2013 Global and superlinear convergence of the smoothing Newton method and its application to general box constrained variational inequalities. Zbl 0894.90143 Chen, X.; Qi, L.; Sun, D. 143 1998 A smoothing method for mathematical programs with equilibrium constraints. Zbl 0959.65079 Facchinei, Francisco; Jiang, Houyuan; Qi, Liqun 131 1999 Eigenvalues and invariants of tensors. Zbl 1113.15020 Qi, Liqun 127 2007 Tensor eigenvalues and their applications. Zbl 1398.15001 Qi, Liqun; Chen, Haibin; Chen, Yannan 120 2018 Properties of some classes of structured tensors. Zbl 1390.15085 Song, Yisheng; Qi, Liqun 114 2015 On the constant positive linear dependence condition and its application to SQP methods. Zbl 0999.90037 Qi, Liqun; Wei, Zengxin 112 2000 Smoothing methods and semismooth methods for nondifferentiable operator equations. Zbl 0979.65046 Chen, Xiaojun; Nashed, Zuhair; Qi, Liqun 108 2000 Positive-definite tensors to nonlinear complementarity problems. Zbl 1334.90174 Che, Maolin; Qi, Liqun; Wei, Yimin 106 2016 \(H^{+}\)-eigenvalues of Laplacian and signless Laplacian tensors. Zbl 1305.05134 Qi, Liqun 103 2014 Higher order positive semidefinite diffusion tensor imaging. Zbl 1197.92032 Qi, Liqun; Yu, Gaohang; Wu, Ed X. 103 2010 The sparsest solutions to \(Z\)-tensor complementarity problems. Zbl 1394.90540 Luo, Ziyan; Qi, Liqun; Xiu, Naihua 100 2017 An eigenvalue method for testing positive definiteness of a multivariate form. Zbl 1367.93565 Ni, Qin; Qi, Liqun; Wang, Fei 98 2008 Formulating an \(n\)-person noncooperative game as a tensor complementarity problem. Zbl 1393.90120 Huang, Zheng-Hai; Qi, Liqun 98 2017 On determinants and eigenvalue theory of tensors. Zbl 1259.15038 Hu, Shenglong; Huang, Zheng-Hai; Ling, Chen; Qi, Liqun 96 2013 Z-eigenvalue methods for a global polynomial optimization problem. Zbl 1169.90022 Qi, Liqun; Wang, Fei; Wang, Yiju 94 2009 New quasi-Newton methods for unconstrained optimization problems. Zbl 1100.65054 Wei, Zengxin; Li, Guoyin; Qi, Liqun 88 2006 Tensor complementarity problem and semi-positive tensors. Zbl 1349.90803 Song, Yisheng; Qi, Liqun 88 2016 Cored hypergraphs, power hypergraphs and their Laplacian H-eigenvalues. Zbl 1282.05171 Hu, Shenglong; Qi, Liqun; Shao, Jia-Yu 85 2013 A practical method for computing the largest \(M\)-eigenvalue of a fourth-order partially symmetric tensor. Zbl 1224.65101 Wang, Yiju; Qi, Liqun; Zhang, Xinzhen 83 2009 Algebraic connectivity of an even uniform hypergraph. Zbl 1261.05072 Hu, Shenglong; Qi, Liqun 82 2012 On NCP-functions. Zbl 1040.90544 Sun, Defeng; Qi, Liqun 77 1999 A new nonsmooth equations approach to nonlinear complementarity problems. Zbl 0872.90097 Jiang, Houyuan; Qi, Liqun 75 1997 D-eigenvalues of diffusion kurtosis tensors. Zbl 1176.65046 Qi, Liqun; Wang, Yiju; Wu, Ed X. 74 2008 Biquadratic optimization over unit spheres and semidefinite programming relaxations. Zbl 1221.90074 Ling, Chen; Nie, Jiawang; Qi, Liqun; Ye, Yinyu 72 2009 The \(Z\)-eigenvalues of a symmetric tensor and its application to spectral hypergraph theory. Zbl 1313.65081 Li, Guoyin; Qi, Liqun; Yu, Gaohang 71 2013 A survey on the spectral theory of nonnegative tensors. Zbl 1313.15015 Chang, Kungching; Qi, Liqun; Zhang, Tan 70 2013 Numerical multilinear algebra and its applications. Zbl 1134.65033 Qi, Liqun; Sun, Wenyu; Wang, Yiju 65 2007 Inexact Newton methods for solving nonsmooth equations. Zbl 0833.65045 Martínez, José Mario; Qi, Liqun 65 1995 The extremal spectral radii of \(k\)-uniform supertrees. Zbl 1378.90084 Li, Honghai; Shao, Jia-Yu; Qi, Liqun 63 2016 Conditions for strong ellipticity and M-eigenvalues. Zbl 1233.74004 Qi, Liqun; Dai, Hui-Hui; Han, Deren 62 2009 An even order symmetric \(B\) tensor is positive definite. Zbl 1295.15017 Qi, Liqun; Song, Yisheng 60 2014 Properties of tensor complementarity problem and some classes of structured tensors. Zbl 1399.15036 Song, Yisheng; Qi, Liqun 59 2017 Conditions for strong ellipticity of anisotropic elastic materials. Zbl 1252.74006 Han, Deren; Dai, H. H.; Qi, Liqun 54 2009 A globally and superlinearly convergent algorithm for nonsmooth convex minimization. Zbl 0868.90109 Fukushima, Masao; Qi, Liqun 54 1996 Strictly nonnegative tensors and nonnegative tensor partition. Zbl 1312.15035 Hu, Shenglong; Huang, Zhenghai; Qi, Liqun 54 2014 Spectral properties of positively homogeneous operators induced by higher order tensors. Zbl 1355.15009 Song, Yisheng; Qi, Liqun 54 2013 Tensor complementarity problems. I: Basic theory. Zbl 1434.90203 Huang, Zheng-Hai; Qi, Liqun 54 2019 Rank and eigenvalues of a supersymmetric tensor, the multivariate homogeneous polynomial and the algebraic hypersurface it defines. Zbl 1121.14050 Qi, Liqun 53 2006 The best rank-1 approximation of a symmetric tensor and related spherical optimization problems. Zbl 1269.15026 Zhang, Xinzhen; Ling, Chen; Qi, Liqun 52 2012 Generalized tensor function via the tensor singular value decomposition based on the T-product. Zbl 1437.15034 Miao, Yun; Qi, Liqun; Wei, Yimin 51 2020 The eigenvectors associated with the zero eigenvalues of the Laplacian and signless Laplacian tensors of a uniform hypergraph. Zbl 1288.05157 Hu, Shenglong; Qi, Liqun 51 2014 Sub-quadratic convergence of a smoothing Newton algorithm for the \(P_0\)- and monotone LCP. Zbl 1168.90646 Huang, Zheng-Hai; Qi, Liqun; Sun, Defeng 49 2004 The largest Laplacian and signless Laplacian \(H\)-eigenvalues of a uniform hypergraph. Zbl 1305.05129 Hu, Shenglong; Qi, Liqun; Xie, Jinshan 49 2015 Smoothing functions and smoothing Newton method for complementarity and variational inequality problems. Zbl 1032.49017 Qi, L.; Sun, D. 49 2002 Improving the convergence of non-interior point algorithms for nonlinear complementarity problems. Zbl 0947.90117 Qi, Liqun; Sun, Defeng 48 2000 Column sufficient tensors and tensor complementarity problems. Zbl 1418.90253 Chen, Haibin; Qi, Liqun; Song, Yisheng 48 2018 Superlinearly convergent approximate Newton methods for LC\(^ 1\) optimization problems. Zbl 0820.90102 Qi, Liqun 47 1994 The best rank-one approximation ratio of a tensor space. Zbl 1228.15010 Qi, Liqun 46 2011 Linear convergence of an algorithm for computing the largest eigenvalue of a nonnegative tensor. Zbl 1274.65129 Zhang, Liping; Qi, Liqun 46 2012 Nonnegative tensor factorization, completely positive tensors, and a hierarchical elimination algorithm. Zbl 1317.65114 Qi, Liqun; Xu, Changqing; Xu, Yi 44 2014 Tensor complementarity problems. III: Applications. Zbl 1433.90169 Huang, Zheng-Hai; Qi, Liqun 44 2019 The degree of the E-characteristic polynomial of an even order tensor. Zbl 1154.15304 Ni, Guyan; Qi, Liqun; Wang, Fei; Wang, Yiju 42 2007 Strictly semi-positive tensors and the boundedness of tensor complementarity problems. Zbl 1454.90098 Song, Yisheng; Qi, Liqun 42 2017 On the cone eigenvalue complementarity problem for higher-order tensors. Zbl 1339.15008 Ling, Chen; He, Hongjin; Qi, Liqun 42 2016 Necessary and sufficient conditions for copositive tensors. Zbl 1311.15026 Song, Yisheng; Qi, Liqun 42 2015 A quadratically convergent algorithm for finding the largest eigenvalue of a nonnegative homogeneous polynomial map. Zbl 1342.90150 Ni, Qin; Qi, Liqun 42 2015 Tensor complementarity problems. II: Solution methods. Zbl 1429.90082 Qi, Liqun; Huang, Zheng-Hai 42 2019 Positive definiteness and semi-definiteness of even order symmetric Cauchy tensors. Zbl 1371.15023 Chen, Haibin; Qi, Liqun 41 2015 Singular values of a real rectangular tensor. Zbl 1201.15003 Chang, Kungching; Qi, Liqun; Zhou, Guanglu 41 2010 Active-set projected trust-region algorithm for box-constrained nonsmooth equations. Zbl 1140.65331 Qi, L.; Tong, X. J.; Li, D. H. 40 2004 Semismooth Karush-Kuhn-Tucker equations and convergence analysis of Newton and quasi-Newton methods for solving these equations. Zbl 0881.65054 Qi, Liqun; Jiang, Houyuan 40 1997 Multivariate polynomial minimization and its application in signal processing. Zbl 1023.90064 Qi, Liqun; Teo, Kok Lay 40 2003 Infinite and finite dimensional Hilbert tensors. Zbl 1292.15027 Song, Yisheng; Qi, Liqun 40 2014 A globally convergent successive approximation method for severely nonsmooth equations. Zbl 0833.90109 Qi, Liqun; Chen, Xiaojun 38 1995 Hankel tensors: associated Hankel matrices and Vandermonde decomposition. Zbl 1331.15020 Qi, Liqun 38 2015 \(\mathrm{P}\)-tensors, \(\mathrm{P}_0\)-tensors, and their applications. Zbl 1396.15020 Ding, Weiyang; Luo, Ziyan; Qi, Liqun 38 2018 Some simple estimates for singular values of a matrix. Zbl 0525.15009 Qi, Liqun 37 1984 Descent directions of quasi-Newton methods for symmetric nonlinear equations. Zbl 1047.65032 Gu, Guang-Ze; Li, Dong-Hui; Qi, Liqun; Zhou, Shu-Zi 37 2002 A new QP-free, globally convergent, locally superlinearly convergent algorithm for inequality constrained optimization. Zbl 0999.90038 Qi, Hou-Duo; Qi, Liqun 36 2000 A survey of some nonsmooth equations and smoothing Newton methods. Zbl 0957.65042 Qi, L.; Sun, D. 36 1999 New nonlinear conjugate gradient formulas for large-scale unconstrained optimization problems. Zbl 1106.65055 Wei, Zengxin; Li, Guoyin; Qi, Liqun 36 2006 A parameterized Newton method and a quasi-Newton method for nonsmooth equations. Zbl 0821.65029 Chen, Xiaojun; Qi, Liqun 36 1994 A trust region method for solving generalized complementarity problems. Zbl 0911.90324 Jiang, Houyuan; Fukushima, Masao; Qi, Liqun; Sun, Defeng 35 1998 A globally convergent Newton method for convex \(SC^ 1\) minimization problems. Zbl 0831.90095 Pang, J. S.; Qi, L. 35 1995 A semidefinite program approach for computing the maximum eigenvalue of a class of structured tensors and its applications in hypergraphs and copositivity test. Zbl 1438.65060 Chen, Haibin; Chen, Yannan; Li, Guoyin; Qi, Liqun 35 2018 A squared smoothing Newton method for nonsmooth matrix equations and its applications in semidefinite optimization problems. Zbl 1079.90094 Sun, Jie; Sun, Defeng; Qi, Liqun 35 2004 A smoothing Newton method for semi-infinite programming. Zbl 1066.90131 Li, Dong-Hui; Qi, Liqun; Tam, Judy; Wu, Soon-Yi 35 2004 Copositivity detection of tensors: theory and algorithm. Zbl 1377.65060 Chen, Haibin; Huang, Zheng-Hai; Qi, Liqun 35 2017 The Laplacian of a uniform hypergraph. Zbl 1309.05120 Hu, Shenglong; Qi, Liqun 35 2015 Semismooth Newton methods for solving semi-infinite programming problems. Zbl 1033.90137 Qi, Liqun; Wu, Soon-Yi; Zhou, Guanglu 35 2003 Regular uniform hypergraphs, \(s\)-cycles, \(s\)-paths and their largest Laplacian H-eigenvalues. Zbl 1282.05174 Qi, Liqun; Shao, Jia-Yu; Wang, Qun 35 2014 Secant methods for semismooth equations. Zbl 0914.65051 Potra, Florian A.; Qi, Liqun; Sun, Defeng 34 1998 Copositive tensor detection and its applications in physics and hypergraphs. Zbl 1383.65061 Chen, Haibin; Huang, Zheng-Hai; Qi, Liqun 34 2018 On the convergence of a trust-region method for solving constrained nonlinear equations with degenerate solutions. Zbl 1069.65055 Tong, X. J.; Qi, L. 33 2004 A trust region algorithm for minimization of locally Lipschitzian functions. Zbl 0821.90108 Qi, Liqun; Sun, Jie 32 1994 Tensor absolute value equations. Zbl 1401.15024 Du, Shouqiang; Zhang, Liping; Chen, Chiyu; Qi, Liqun 32 2018 Computing block-angular Karmarkar projections with applications to stochastic programming. Zbl 0664.90051 Birge, John R.; Qi, Liqun 31 1988 A globally and quadratically convergent algorithm for solving multilinear systems with \(\mathcal {M}\)-tensors. Zbl 1397.65047 He, Hongjin; Ling, Chen; Qi, Liqun; Zhou, Guanglu 31 2018 Fast Hankel tensor-vector product and its application to exponential data fitting. Zbl 1349.65070 Ding, Weiyang; Qi, Liqun; Wei, Yimin 30 2015 Global convergence of the Polak-Ribière-Polyak conjugate gradient method with an Armijo-type inexact line search for nonconvex unconstrained optimization problems. Zbl 1198.65091 Wei, Zeng Xin; Li, Guo Yin; Qi, Li Qun 30 2008 Eigenvalues and singular values of dual quaternion matrices. Zbl 1510.15022 Qi, Liqun; Luo, Ziyan 8 2023 The C-eigenvalue of third order tensors and its application in crystals. Zbl 1513.15043 Chen, Yannan; Jákli, Antal; Qi, Liqun 6 2023 Standard dual quaternion optimization and its applications in hand-eye calibration and SLAM. Zbl 07776125 Qi, Liqun 1 2023 Optimality conditions for Tucker low-rank tensor optimization. Zbl 07786401 Luo, Ziyan; Qi, Liqun 1 2023 Low Tucker rank tensor completion using a symmetric block coordinate descent method. Zbl 07729587 Yu, Quan; Zhang, Xinzhen; Chen, Yannan; Qi, Liqun 1 2023 Quaternion matrix optimization: motivation and analysis. Zbl 1527.90227 Qi, Liqun; Luo, Ziyan; Wang, Qing-Wen; Zhang, Xinzhen 12 2022 Dual quaternions and dual quaternion vectors. Zbl 1513.15042 Qi, Liqun; Ling, Chen; Yan, Hong 10 2022 Singular values of dual quaternion matrices and their low-rank approximations. Zbl 1503.15006 Ling, Chen; He, Hongjin; Qi, Liqun 5 2022 Spectral norm and nuclear norm of a third order tensor. Zbl 1499.15077 Qi, Liqun; Hu, Shenglong; Xu, Yanwei 4 2022 ST-SVD factorization and s-diagonal tensors. Zbl 1487.15032 Ling, Chen; Liu, Jinjie; Ouyang, Chen; Qi, Liqun 2 2022 Positivity conditions for cubic, quartic and quintic polynomials. Zbl 1517.26011 Qi, Liqun; Song, Yisheng; Zhang, Xinzhen 2 2022 Color image completion using a low-rank quaternion matrix approximation. Zbl 07506667 Chen, Yannan; Qi, Liqun; Zhang, Xinzhen 2 2022 T-Jordan canonical form and T-Drazin inverse based on the T-product. Zbl 1476.15045 Miao, Yun; Qi, Liqun; Wei, Yimin 27 2021 Triple decomposition and tensor recovery of third order tensors. Zbl 1467.15020 Qi, Liqun; Chen, Yannan; Bakshi, Mayank; Zhang, Xinzhen 6 2021 Analytical expressions of copositivity for fourth-order symmetric tensors. Zbl 07421751 Song, Yisheng; Qi, Liqun 5 2021 T-product factorization method for internet traffic data completion with spatio-temporal regularization. Zbl 1482.90213 Ling, Chen; Yu, Gaohang; Qi, Liqun; Xu, Yanwei 5 2021 A Barzilai-Borwein gradient algorithm for spatio-temporal internet traffic data completion via tensor triple decomposition. Zbl 1528.68041 Chen, Yannan; Zhang, Xinzhen; Qi, Liqun; Xu, Yanwei 2 2021 Biquadratic tensors, biquadratic decompositions, and norms of biquadratic tensors. Zbl 1469.15030 Qi, Liqun; Hu, Shenglong; Zhang, Xinzhen; Xu, Yanwei 1 2021 Generalized tensor function via the tensor singular value decomposition based on the T-product. Zbl 1437.15034 Miao, Yun; Qi, Liqun; Wei, Yimin 51 2020 Modified gradient dynamic approach to the tensor complementarity problem. Zbl 1432.37105 Wang, Xuezhong; Che, Maolin; Qi, Liqun; Wei, Yimin 23 2020 Elasticity \(\mathcal{M} \)-tensors and the strong ellipticity condition. Zbl 1433.74028 Ding, Weiyang; Liu, Jinjie; Qi, Liqun; Yan, Hong 16 2020 Further study on tensor absolute value equations. Zbl 1469.15017 Ling, Chen; Yan, Weijie; He, Hongjin; Qi, Liqun 9 2020 Hypergraph clustering using a new Laplacian tensor with applications in image processing. Zbl 1451.05136 Chang, Jingya; Chen, Yannan; Qi, Liqun; Yan, Hong 6 2020 The generalized order tensor complementarity problems. Zbl 1463.90221 Che, Maolin; Qi, Liqun; Wei, Yimin 6 2020 Expected residual minimization method for monotone stochastic tensor complementarity problem. Zbl 1466.90113 Ming, Zhenyu; Zhang, Liping; Qi, Liqun 6 2020 Stationary probability vectors of higher-order two-dimensional symmetric transition probability tensors. Zbl 1454.60117 Huang, Zheng-Hai; Qi, Liqun 5 2020 M-eigenvalues of the Riemann curvature tensor of conformally flat manifolds. Zbl 1474.53192 Miao, Yun; Qi, Liqun; Yiminwei 3 2020 Tensor Bernstein concentration inequalities with an application to sample estimators for high-order moments. Zbl 1440.15036 Luo, Ziyan; Qi, Liqun; Toint, Philippe L. 2 2020 A nonmonotone spectral projected gradient method for tensor eigenvalue complementarity problems. Zbl 1473.65077 Tong, Wanbin; He, Hongjin; Ling, Chen; Qi, Liqun 1 2020 A new class of positive semi-definite tensors. Zbl 1449.15028 Xu, Yi; Liu, Jinjie; Qi, Liqun 1 2020 Tensor complementarity problems. I: Basic theory. Zbl 1434.90203 Huang, Zheng-Hai; Qi, Liqun 54 2019 Tensor complementarity problems. III: Applications. Zbl 1433.90169 Huang, Zheng-Hai; Qi, Liqun 44 2019 Tensor complementarity problems. II: Solution methods. Zbl 1429.90082 Qi, Liqun; Huang, Zheng-Hai 42 2019 Stochastic \(R_0\) tensors to stochastic tensor complementarity problems. Zbl 1417.90108 Che, Maolin; Qi, Liqun; Wei, Yimin 24 2019 Test of copositive tensors. Zbl 1463.65141 Li, Li; Zhang, Xinzhen; Huang, Zheng-Hai; Qi, Liqun 13 2019 Nonnegative tensors revisited: plane stochastic tensors. Zbl 1412.15010 Che, Maolin; Bu, Changjiang; Qi, Liqun; Wei, Yimin 8 2019 Birkhoff-von Neumann theorem and decomposition for doubly stochastic tensors. Zbl 1425.65065 Chen, Haibin; Qi, Liqun; Caccetta, Louis; Zhou, Guanglu 7 2019 Irreducible function bases of isotropic invariants of a third order three-dimensional symmetric and traceless tensor. Zbl 1411.15020 Chen, Yannan; Hu, Shenglong; Qi, Liqun; Zou, Wennan 2 2019 Two irreducible functional bases of isotropic invariants of a fourth-order three-dimensional symmetric and traceless tensor. Zbl 07273355 Chen, Zhongming; Chen, Yannan; Qi, Liqun; Zou, Wennan 1 2019 Tensor eigenvalues and their applications. Zbl 1398.15001 Qi, Liqun; Chen, Haibin; Chen, Yannan 120 2018 Column sufficient tensors and tensor complementarity problems. Zbl 1418.90253 Chen, Haibin; Qi, Liqun; Song, Yisheng 48 2018 \(\mathrm{P}\)-tensors, \(\mathrm{P}_0\)-tensors, and their applications. Zbl 1396.15020 Ding, Weiyang; Luo, Ziyan; Qi, Liqun 38 2018 A semidefinite program approach for computing the maximum eigenvalue of a class of structured tensors and its applications in hypergraphs and copositivity test. Zbl 1438.65060 Chen, Haibin; Chen, Yannan; Li, Guoyin; Qi, Liqun 35 2018 Copositive tensor detection and its applications in physics and hypergraphs. Zbl 1383.65061 Chen, Haibin; Huang, Zheng-Hai; Qi, Liqun 34 2018 Tensor absolute value equations. Zbl 1401.15024 Du, Shouqiang; Zhang, Liping; Chen, Chiyu; Qi, Liqun 32 2018 A globally and quadratically convergent algorithm for solving multilinear systems with \(\mathcal {M}\)-tensors. Zbl 1397.65047 He, Hongjin; Ling, Chen; Qi, Liqun; Zhou, Guanglu 31 2018 Global uniqueness and solvability of tensor variational inequalities. Zbl 1409.90207 Wang, Yong; Huang, Zheng-Hai; Qi, Liqun 30 2018 A fast algorithm for the spectral radii of weakly reducible nonnegative tensors. Zbl 1499.65132 Zhou, Guanglu; Wang, Gang; Qi, Liqun; Alqahtani, Mohammed 29 2018 Positive definiteness of paired symmetric tensors and elasticity tensors. Zbl 1392.74015 Huang, Zheng-Hai; Qi, Liqun 21 2018 Octupolar tensors for liquid crystals. Zbl 1383.82065 Chen, Yannan; Qi, Liqun; Virga, Epifanio G. 18 2018 How entangled can a multi-party system possibly be? Zbl 1428.81030 Qi, Liqun; Zhang, Guofeng; Ni, Guyan 13 2018 Spectral radii of two kinds of uniform hypergraphs. Zbl 1427.05136 Kang, Liying; Liu, Lele; Qi, Liqun; Yuan, Xiying 12 2018 Computing the \(p\)-spectral radii of uniform hypergraphs with applications. Zbl 1386.05103 Chang, Jingya; Ding, Weiyang; Qi, Liqun; Yan, Hong 11 2018 An irreducible function basis of isotropic invariants of a third order three-dimensional symmetric tensor. Zbl 1467.74009 Chen, Zhongming; Liu, Jinjie; Qi, Liqun; Zheng, Quanshui; Zou, Wennan 7 2018 \(M\)-eigenvalues of the Riemann curvature tensor. Zbl 1417.83012 Qi, Liqun; Wei, Yimin; Xiang, Hua 6 2018 Isotropic polynomial invariants of Hall tensor. Zbl 1416.15020 Liu, Jinjie; Ding, Weiyang; Qi, Liqun; Zou, Wennan 4 2018 Some properties and applications of odd-colorable \(r\)-hypergraphs. Zbl 1377.05133 Yuan, Xiying; Qi, Liqun; Shao, Jiayu; Ouyang, Chen 3 2018 A quadratic penalty method for hypergraph matching. Zbl 1393.90093 Cui, Chunfeng; Li, Qingna; Qi, Liqun; Yan, Hong 2 2018 A note on the multidimensional moment problem. Zbl 1405.44007 Qi, Liqun 2 2018 Tensor analysis. Spectral theory and special tensors. Zbl 1370.15001 Qi, Liqun; Luo, Ziyan 249 2017 The sparsest solutions to \(Z\)-tensor complementarity problems. Zbl 1394.90540 Luo, Ziyan; Qi, Liqun; Xiu, Naihua 100 2017 Formulating an \(n\)-person noncooperative game as a tensor complementarity problem. Zbl 1393.90120 Huang, Zheng-Hai; Qi, Liqun 98 2017 Properties of tensor complementarity problem and some classes of structured tensors. Zbl 1399.15036 Song, Yisheng; Qi, Liqun 59 2017 Strictly semi-positive tensors and the boundedness of tensor complementarity problems. Zbl 1454.90098 Song, Yisheng; Qi, Liqun 42 2017 Copositivity detection of tensors: theory and algorithm. Zbl 1377.65060 Chen, Haibin; Huang, Zheng-Hai; Qi, Liqun 35 2017 The first few unicyclic and bicyclic hypergraphs with largest spectral radii. Zbl 1365.15024 Ouyang, Chen; Qi, Liqun; Yuan, Xiying 21 2017 Programmable criteria for strong \(\mathcal {H}\)-tensors. Zbl 1357.65048 Li, Yaotang; Liu, Qilong; Qi, Liqun 19 2017 The Fiedler vector of a Laplacian tensor for hypergraph partitioning. Zbl 1375.05184 Chen, Yannan; Qi, Liqun; Zhang, Xiaoyan 19 2017 The adjacency and signless Laplacian spectra of cored hypergraphs and power hypergraphs. Zbl 1368.05099 Yue, Jun-Jie; Zhang, Li-Ping; Lu, Mei; Qi, Li-Qun 7 2017 Inheritance properties and sum-of-squares decomposition of Hankel tensors: theory and algorithms. Zbl 1360.65121 Ding, Weiyang; Qi, Liqun; Wei, Yimin 7 2017 Pseudo-spectra theory of tensors and tensor polynomial eigenvalue problems. Zbl 1371.15010 Che, Maolin; Li, Guoyin; Qi, Liqun; Wei, Yimin 7 2017 Regularly decomposable tensors and classical spin states. Zbl 1390.15034 Qi, Liqun; Zhang, Guofeng; Braun, Daniel; Bohnet-Waldraff, Fabian; Giraud, Olivier 4 2017 Iterative algorithms for computing US- and U-eigenpairs of complex tensors. Zbl 1357.65042 Che, Maolin; Qi, Liqun; Wei, Yimin 4 2017 Improved approximation results on standard quartic polynomial optimization. Zbl 1410.90167 Ling, Chen; He, Hongjin; Qi, Liqun 3 2017 New classes of positive semi-definite Hankel tensors. Zbl 1409.15008 Wang, Qun; Li, Guoyin; Qi, Liqun; Xu, Yi 3 2017 Infinite-dimensional Hilbert tensors on spaces of analytic functions. Zbl 1390.30058 Song, Yisheng; Qi, Liqun 2 2017 Tensor and hypergraph. Zbl 1391.00053 1 2017 Positive-definite tensors to nonlinear complementarity problems. Zbl 1334.90174 Che, Maolin; Qi, Liqun; Wei, Yimin 106 2016 Tensor complementarity problem and semi-positive tensors. Zbl 1349.90803 Song, Yisheng; Qi, Liqun 88 2016 The extremal spectral radii of \(k\)-uniform supertrees. Zbl 1378.90084 Li, Honghai; Shao, Jia-Yu; Qi, Liqun 63 2016 On the cone eigenvalue complementarity problem for higher-order tensors. Zbl 1339.15008 Ling, Chen; He, Hongjin; Qi, Liqun 42 2016 Eigenvalue analysis of constrained minimization problem for homogeneous polynomial. Zbl 1341.15009 Song, Yisheng; Qi, Liqun 28 2016 Circulant tensors with applications to spectral hypergraph theory and stochastic process. Zbl 1364.15017 Chen, Zhongming; Qi, Liqun 20 2016 Computing extreme eigenvalues of large scale Hankel tensors. Zbl 1377.65046 Chen, Yannan; Qi, Liqun; Wang, Qun 19 2016 Completely positive tensors: properties, easily checkable subclasses, and tractable relaxations. Zbl 1349.15026 Luo, Ziyan; Qi, Liqun 17 2016 Comon’s conjecture, rank decomposition, and symmetric rank decomposition of symmetric tensors. Zbl 1349.15004 Zhang, Xinzhen; Huang, Zheng-Hai; Qi, Liqun 17 2016 Higher-degree eigenvalue complementarity problems for tensors. Zbl 1338.15027 Ling, Chen; He, Hongjin; Qi, Liqun 16 2016 The proof of a conjecture on largest Laplacian and signless Laplacian H-eigenvalues of uniform hypergraphs. Zbl 1330.15025 Yuan, Xiying; Qi, Liqun; Shao, Jiayu 15 2016 SOS tensor decomposition: theory and applications. Zbl 1351.90148 Chen, Haibin; Li, Guoyin; Qi, Liqun 14 2016 A semismooth Newton method for tensor eigenvalue complementarity problem. Zbl 1377.90096 Chen, Zhongming; Qi, Liqun 14 2016 Computing eigenvalues of large scale sparse tensors arising from a hypergraph. Zbl 1350.05109 Chang, Jingya; Chen, Yannan; Qi, Liqun 13 2016 A tensor analogy of Yuan’s theorem of the alternative and polynomial optimization with sign structure. Zbl 1338.90317 Hu, Shenglong; Li, Guoyin; Qi, Liqun 13 2016 Spectral directed hypergraph theory via tensors. Zbl 1335.05125 Xie, Jinshan; Qi, Liqun 13 2016 Positive semi-definiteness and sum-of-squares property of fourth order four dimensional Hankel tensors. Zbl 1334.15025 Chen, Yannan; Qi, Liqun; Wang, Qun 10 2016 Further results on Cauchy tensors and Hankel tensors. Zbl 1410.15048 Chen, Haibin; Li, Guoyin; Qi, Liqun 10 2016 A necessary and sufficient condition for existence of a positive Perron vector. Zbl 1355.15019 Hu, Shenglong; Qi, Liqun 8 2016 Perturbation bounds of tensor eigenvalue and singular value problems with even order. Zbl 1344.15007 Che, Maolin; Qi, Liqun; Wei, Yimin 6 2016 Positive semi-definiteness of generalized anti-circulant tensors. Zbl 1353.15026 Li, Guoyin; Qi, Liqun; Wang, Qun 4 2016 \(\{0,1\}\) completely positive tensors and multi-hypergraphs. Zbl 1354.05099 Xu, Changqing; Luo, Ziyan; Qi, Liqun; Chen, Zhibing 4 2016 Spectral properties of odd-bipartite \(Z\)-tensors and their absolute tensors. Zbl 1360.90237 Chen, Haibin; Qi, Liqun 3 2016 ...and 250 more Documents all cited Publications top 5 cited Publications all top 5 Cited by 3,566 Authors 219 Qi, Liqun 69 Huang, Zheng-Hai 58 Wei, Yimin 52 Ma, Changfeng 51 Wang, Yiju 44 Hu, ShengLong 44 Kanzow, Christian 41 Yuan, Gonglin 36 Chen, Jein-Shan 36 Li, Chaoqian 35 Bu, Changjiang 35 Ling, Chen 35 Martínez, José Mario 34 Sun, Defeng 34 Zhang, Liwei 33 Chen, Haibin 33 Wei, Zengxin 32 Li, Yaotang 32 Zhou, Guanglu 31 Jian, Jinbao 30 Zhao, Jianxing 28 Sun, Jie 27 Chen, Xiaojun 27 Du, Shouqiang 27 Zhang, Liping 26 Andreani, Roberto 26 Li, Wen 26 Song, Yisheng 26 Tang, Jingyong 26 Zhang, Xinzhen 25 He, Jun 23 Chen, Yannan 23 Fukushima, Masao 23 Sang, Caili 23 Zhou, Jinchuan 21 Gao, Yan 21 Liu, Sanyang 20 Che, Maolin 20 Haeser, Gabriel 20 Li, Donghui 20 Toh, Kim Chuan 20 Wu, Soon-Yi 19 Pan, Shaohua 19 Pu, Dingguo 19 Sun, Wenyu 19 Wang, Qingwen 19 Xiu, Naihua 19 Yang, Qingzhi 18 Fan, Yizheng 18 Liu, Yanmin 18 Wang, Gang 18 Yang, Yuning 17 Fang, Liang 17 He, Hongjin 17 Kang, Liying 17 Shen, Chungen 16 Babaie-Kafaki, Saman 16 Li, Guoyin 16 Tong, Xiaojiao 16 Wang, Ligong 16 Yang, Xiaoqi 16 Yu, Bo 16 Zhang, Jianzhong 15 Birgin, Ernesto G. 15 Cui, Lubin 15 Ding, Weiyang 15 Dong, Li 15 Li, Zhening 15 Ni, Qin 15 Ou, Yigui 15 Sheng, Zhou 15 Vong, Seakweng 15 Zhou, Jiang 14 Chiou, Suh-Wen 14 Fan, Jinyan 14 Han, Deren 14 Liao, Li-Zhi 14 Liu, Hongwei 14 Ng, Michael Kwok-Po 14 Nie, Jiawang 14 Pang, Jong-Shi 13 Che, Haitao 13 Ma, Haifeng 13 Qi, Houduo 13 Stechlinski, Peter G. 13 Wan, Zhong 13 Xu, Huifu 13 Zhu, Zhibin 12 Ferreira, Orizon Pereira 12 Lin, Guihua 12 Ni, Guyan 12 Shan, Erfang 12 Shao, Jiayu 12 Śmietański, Marek J. 12 Wang, Xuezhong 12 Wang, Yong 12 Yan, Hong 12 You, Lihua 12 Yu, Gaohang 12 Yuan, Xiying ...and 3,466 more Authors all top 5 Cited in 353 Serials 225 Journal of Optimization Theory and Applications 178 Computational Optimization and Applications 174 Journal of Computational and Applied Mathematics 172 Applied Mathematics and Computation 165 Linear Algebra and its Applications 126 Mathematical Programming. Series A. Series B 96 Journal of Global Optimization 96 Journal of Industrial and Management Optimization 88 Optimization Methods & Software 87 Linear and Multilinear Algebra 77 Computational and Applied Mathematics 74 Optimization 66 SIAM Journal on Optimization 65 Numerical Algorithms 61 Journal of Inequalities and Applications 60 Frontiers of Mathematics in China 56 Journal of Applied Mathematics and Computing 49 Numerical Functional Analysis and Optimization 49 Mathematical Problems in Engineering 48 Optimization Letters 43 Computers & Mathematics with Applications 42 SIAM Journal on Matrix Analysis and Applications 39 Applied Numerical Mathematics 39 International Journal of Computer Mathematics 35 Journal of Scientific Computing 33 Journal of Mathematical Analysis and Applications 33 European Journal of Operational Research 32 Numerical Linear Algebra with Applications 28 Applied Mathematics Letters 26 Abstract and Applied Analysis 24 Nonlinear Analysis. 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The Electronic Journal of Linear Algebra 8 Taiwanese Journal of Mathematics 8 Quantum Information Processing 8 Mathematical Programming Computation 7 BIT 7 SIAM Journal on Numerical Analysis 7 Journal of Elasticity 7 Journal of Convex Analysis 7 SIAM Journal on Imaging Sciences 6 Mathematics and Computers in Simulation 6 Mathematical and Computer Modelling 6 Neural Networks 6 Journal of Mathematical Imaging and Vision 6 European Series in Applied and Industrial Mathematics (ESAIM): Control, Optimization and Calculus of Variations 6 Positivity 6 The ANZIAM Journal 6 Journal of Mathematical Modeling 6 Nonlinear Analysis. Theory, Methods & Applications 6 SIAM Journal on Applied Algebra and Geometry 6 AIMS Mathematics 5 Journal of the Franklin Institute 5 Computational Mechanics 5 Journal of Mathematical Sciences (New York) 5 Vietnam Journal of Mathematics ...and 253 more Serials all top 5 Cited in 53 Fields 2,107 Operations research, mathematical programming (90-XX) 1,534 Numerical analysis (65-XX) 1,024 Linear and multilinear algebra; matrix theory (15-XX) 525 Calculus of variations and optimal control; optimization (49-XX) 248 Combinatorics (05-XX) 115 Game theory, economics, finance, and other social and behavioral sciences (91-XX) 112 Operator theory (47-XX) 109 Computer science (68-XX) 108 Mechanics of deformable solids (74-XX) 65 Partial differential equations (35-XX) 60 Information and communication theory, circuits (94-XX) 58 Statistics (62-XX) 57 Probability theory and stochastic processes (60-XX) 55 Systems theory; control (93-XX) 54 Algebraic geometry (14-XX) 48 Quantum theory (81-XX) 42 Real functions (26-XX) 35 Fluid mechanics (76-XX) 30 Ordinary differential equations (34-XX) 30 Differential geometry (53-XX) 21 Commutative algebra (13-XX) 21 Convex and discrete geometry (52-XX) 21 Biology and other natural sciences (92-XX) 20 Dynamical systems and ergodic theory (37-XX) 20 Functional analysis (46-XX) 17 Global analysis, analysis on manifolds (58-XX) 14 Approximations and expansions (41-XX) 14 Mechanics of particles and systems (70-XX) 13 Statistical mechanics, structure of matter (82-XX) 8 General topology (54-XX) 7 Number theory (11-XX) 6 Field theory and polynomials (12-XX) 5 Harmonic analysis on Euclidean spaces (42-XX) 5 Integral transforms, operational calculus (44-XX) 5 Relativity and gravitational theory (83-XX) 4 General and overarching topics; collections (00-XX) 4 Order, lattices, ordered algebraic structures (06-XX) 4 Functions of a complex variable (30-XX) 4 Integral equations (45-XX) 3 History and biography (01-XX) 3 Nonassociative rings and algebras (17-XX) 3 Measure and integration (28-XX) 3 Several complex variables and analytic spaces (32-XX) 3 Difference and functional equations (39-XX) 3 Manifolds and cell complexes (57-XX) 3 Optics, electromagnetic theory (78-XX) 3 Geophysics (86-XX) 2 Mathematical logic and foundations (03-XX) 2 Special functions (33-XX) 2 Algebraic topology (55-XX) 2 Classical thermodynamics, heat transfer (80-XX) 1 Associative rings and algebras (16-XX) 1 Potential theory (31-XX) Citations by Year Wikidata Timeline The data are displayed as stored in Wikidata under a Creative Commons CC0 License. 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