Zhang, Juan; Yang, Jiying Exact solutions of a class of Klein-Gordan equations. (Chinese. English summary) Zbl 1488.35456 J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 7-12 (2021). MSC: 35Q40 PDFBibTeX XMLCite \textit{J. Zhang} and \textit{J. Yang}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 7--12 (2021; Zbl 1488.35456)
Chen, Yining; Chen, Yan Group contribution Shapley value for cooperation games with interval payoffs. (Chinese. English summary) Zbl 1488.91007 J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 55-62 (2021). MSC: 91A12 PDFBibTeX XMLCite \textit{Y. Chen} and \textit{Y. Chen}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 55--62 (2021; Zbl 1488.91007)
Wang, Jingmin; Wang, Liguang The inverse matrix of \(4 \times 4\) block matrix. (Chinese. English summary) Zbl 1488.15008 J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 51-54 (2021). MSC: 15A09 PDFBibTeX XMLCite \textit{J. Wang} and \textit{L. Wang}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 51--54 (2021; Zbl 1488.15008)
Ding, Shanshan \(L^p\) compactness of Riesz transforms and their commutators related to generalized Schrödinger operators. (Chinese. English summary) Zbl 1485.47056 J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 45-50 (2021). MSC: 47B47 35J10 47B07 PDFBibTeX XMLCite \textit{S. Ding}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 45--50 (2021; Zbl 1485.47056)
Li, Yuyan Direct sum decomposition of \(\tau - {C_{11}}\) modules. (Chinese. English summary) Zbl 1488.16081 J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 41-44 (2021). MSC: 16S90 16D70 PDFBibTeX XMLCite \textit{Y. Li}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 41--44 (2021; Zbl 1488.16081)
Gao, Xinyu; Zhao, Shengli Hypothesis test error control for mixed level orthogonal experiment. (Chinese. English summary) Zbl 1488.62127 J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 33-40 (2021). MSC: 62K15 62H15 PDFBibTeX XMLCite \textit{X. Gao} and \textit{S. Zhao}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 33--40 (2021; Zbl 1488.62127)
Li, Shuqi; Zhao, Yongxia Optimal investment and reinsurance strategies with state-dependent risk aversion. (Chinese. English summary) Zbl 1488.91093 J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 25-32 (2021). MSC: 91G05 91G10 PDFBibTeX XMLCite \textit{S. Li} and \textit{Y. Zhao}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 25--32 (2021; Zbl 1488.91093)
Jiang, Yingying; Duan, Pengju; Zhao, Lisha Interval-valued Pythagorean fuzzy geometric weighted Bonferroni mean operator and its application. (Chinese. English summary) Zbl 1488.91031 J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 18-24 (2021). MSC: 91B06 90B50 91B86 PDFBibTeX XMLCite \textit{Y. Jiang} et al., J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 18--24 (2021; Zbl 1488.91031)
Kong, Cuixian; Wu, Hui A differential Harnack inequality of solutions to a class of semilinear parabolic equation. (Chinese. English summary) Zbl 1488.35310 J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 13-17 (2021). MSC: 35K58 26D20 PDFBibTeX XMLCite \textit{C. Kong} and \textit{H. Wu}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 13--17 (2021; Zbl 1488.35310)
Li, Yingke; Zhang, Zhenzhen; Zhang, Yu; Li, Shuangxi; Li, Yansong Application of variable coefficient linear differential equation theory in solving equilibrium state of age structure population model. (Chinese. English summary) Zbl 1488.34279 J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 1-6 (2021). MSC: 34C60 92D25 34C05 PDFBibTeX XMLCite \textit{Y. Li} et al., J. Qufu Norm. Univ., Nat. Sci. 47, No. 3, 1--6 (2021; Zbl 1488.34279)
Zhang, Yuanye; Tan, Yijia On derivations and higher derivations of a formal triangular matrix semiring. (Chinese. English summary) Zbl 1488.16164 J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 7-12 (2021). MSC: 16Y60 16W25 PDFBibTeX XMLCite \textit{Y. Zhang} and \textit{Y. Tan}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 7--12 (2021; Zbl 1488.16164)
Zhang, Cheng; Guo, Dong Toeplitz determinants for the inverse of starlike and convex functions with respect to symmetric points. (Chinese. English summary) Zbl 1488.30150 J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 64-70 (2021). MSC: 30C45 15A15 PDFBibTeX XMLCite \textit{C. Zhang} and \textit{D. Guo}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 64--70 (2021; Zbl 1488.30150)
Guo, Dong; Li, Zongtao Hankel determinants for the inverse of bounded turning functions subordinate to a leaf-like domain. (Chinese. English summary) Zbl 1488.30075 J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 59-63 (2021). MSC: 30C45 30C50 15A15 PDFBibTeX XMLCite \textit{D. Guo} and \textit{Z. Li}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 59--63 (2021; Zbl 1488.30075)
Wang, Shance; Zhang, Zhen A further study about Auslander and Bass classes. (Chinese. English summary) Zbl 1488.16004 J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 55-58 (2021). MSC: 16D20 16D90 16G70 PDFBibTeX XMLCite \textit{S. Wang} and \textit{Z. Zhang}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 55--58 (2021; Zbl 1488.16004)
Sun, Xiaoyang; Xu, Run Existence and uniqueness of solutions for a class of boundary value problems of fractional differential equation. (Chinese. English summary) Zbl 1488.34153 J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 49-54 (2021). MSC: 34B15 34A08 47N20 PDFBibTeX XMLCite \textit{X. Sun} and \textit{R. Xu}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 49--54 (2021; Zbl 1488.34153)
Zhang, Qi; Luan, Shixia Infinitely many solutions for Kirchhoff type equations. (Chinese. English summary) Zbl 1488.35243 J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 44-48, 54 (2021). MSC: 35J62 PDFBibTeX XMLCite \textit{Q. Zhang} and \textit{S. Luan}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 44--48, 54 (2021; Zbl 1488.35243)
Li, Cong; Lu, Yixian; Wang, Yufeng Nontrivial solutions for a nonlinear Choquard equations with concave-convex nonlinearities. (Chinese. English summary) Zbl 1488.35227 J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 35-43 (2021). MSC: 35J60 PDFBibTeX XMLCite \textit{C. Li} et al., J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 35--43 (2021; Zbl 1488.35227)
Yang, Xiaofeng; Dong, Hua The dividend problem under a hybrid observation scheme for a spectrally positive Lévy process. (Chinese. English summary) Zbl 1488.91105 J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 19-26 (2021). MSC: 91G05 60G51 44A10 PDFBibTeX XMLCite \textit{X. Yang} and \textit{H. Dong}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 19--26 (2021; Zbl 1488.91105)
Xie, Xiaojun; Ma, Hong; Qiao, Ximin Triangular fuzzy number combination forecasting model based on similarity. (Chinese. English summary) Zbl 1513.62191 J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 13-18 (2021). MSC: 62M20 62M86 PDFBibTeX XMLCite \textit{X. Xie} et al., J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 13--18 (2021; Zbl 1513.62191)
Zhang, Haiyan; Mo, Shuai; Zhao, Yueyun; Mao, Anmin Multiplicity results for nonlocal fourth-order Kirchhoff equations. (Chinese. English summary) Zbl 1488.35215 J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 1-6 (2021). MSC: 35J35 PDFBibTeX XMLCite \textit{H. Zhang} et al., J. Qufu Norm. Univ., Nat. Sci. 47, No. 2, 1--6 (2021; Zbl 1488.35215)
He, Donglin; Li, Yuyan Auslander projective dimensions of modules. (Chinese. English summary) Zbl 1474.16032 J. Qufu Norm. Univ., Nat. Sci. 47, No. 1, 59-63 (2021). MSC: 16E10 PDFBibTeX XMLCite \textit{D. He} and \textit{Y. Li}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 1, 59--63 (2021; Zbl 1474.16032)
Zhao, Xiaoyang Estimate for the solution of mean curvature equation with Neumann boundary condition. (Chinese. English summary) Zbl 1474.53328 J. Qufu Norm. Univ., Nat. Sci. 47, No. 1, 52-58 (2021). MSC: 53E10 35J93 PDFBibTeX XMLCite \textit{X. Zhao}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 1, 52--58 (2021; Zbl 1474.53328)
Xie, Tiantian; Yang, Hai; Xu, Qian The positive integer solutions of elliptic curves \({y^2} = qx ({x^2} - 256)\). (Chinese. English summary) Zbl 1474.11087 J. Qufu Norm. Univ., Nat. Sci. 47, No. 1, 47-51 (2021). MSC: 11D25 11G05 11G07 PDFBibTeX XMLCite \textit{T. Xie} et al., J. Qufu Norm. Univ., Nat. Sci. 47, No. 1, 47--51 (2021; Zbl 1474.11087)
Liu, Yujiao; Lv, Yuhua VAR model empirical analysis based on nonstationary time series. (Chinese. English summary) Zbl 1474.91128 J. Qufu Norm. Univ., Nat. Sci. 47, No. 1, 41-46, 51 (2021). MSC: 91B84 PDFBibTeX XMLCite \textit{Y. Liu} and \textit{Y. Lv}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 1, 41--46, 51 (2021; Zbl 1474.91128)
Zhou, Xiaoguang; Miao, Cuixia; Hu, Jiaming; Zou, Juan Two uniform machines scheduling with a job-dependent cumulative effect. (Chinese. English summary) Zbl 1474.90172 J. Qufu Norm. Univ., Nat. Sci. 47, No. 1, 30-34 (2021). MSC: 90B35 90C59 PDFBibTeX XMLCite \textit{X. Zhou} et al., J. Qufu Norm. Univ., Nat. Sci. 47, No. 1, 30--34 (2021; Zbl 1474.90172)
Bao, Guanyu; Liu, Li Distribution of roots of total domination polynomial. (Chinese. English summary) Zbl 1474.05204 J. Qufu Norm. Univ., Nat. Sci. 47, No. 1, 25-29 (2021). MSC: 05C31 05C69 PDFBibTeX XMLCite \textit{G. Bao} and \textit{L. Liu}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 1, 25--29 (2021; Zbl 1474.05204)
Ding, Shanshan The boundedness of commutators of Riesz transforms related to generalized Schrödinger operators. (Chinese. English summary) Zbl 1474.42101 J. Qufu Norm. Univ., Nat. Sci. 47, No. 1, 17-24 (2021). MSC: 42B37 47B47 35J10 42B30 PDFBibTeX XMLCite \textit{S. Ding}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 1, 17--24 (2021; Zbl 1474.42101)
Li, Chaofan; Liu, Hui; Xin, Jie The attractors and convergence of dissipative generalized Hasegawa-Mima equation. (Chinese. English summary) Zbl 1474.35120 J. Qufu Norm. Univ., Nat. Sci. 47, No. 1, 11-16 (2021). MSC: 35B41 35Q35 PDFBibTeX XMLCite \textit{C. Li} et al., J. Qufu Norm. Univ., Nat. Sci. 47, No. 1, 11--16 (2021; Zbl 1474.35120)
Wang, Yakun; Meng, Fanwei Oscillation criteria of third-order neutral differential equations with damping and distributed deviating arguments. (Chinese. English summary) Zbl 1474.34457 J. Qufu Norm. Univ., Nat. Sci. 47, No. 1, 1-10 (2021). MSC: 34K11 34K25 34K40 34K07 PDFBibTeX XMLCite \textit{Y. Wang} and \textit{F. Meng}, J. Qufu Norm. Univ., Nat. Sci. 47, No. 1, 1--10 (2021; Zbl 1474.34457)
Chen, Yang; Huang, Baogui SINR based maximum link scheduling in wireless mesh networks. (Chinese. English summary) Zbl 1474.68027 J. Qufu Norm. Univ., Nat. Sci. 46, No. 4, 81-87 (2020). MSC: 68M20 68M18 PDFBibTeX XMLCite \textit{Y. Chen} and \textit{B. Huang}, J. Qufu Norm. Univ., Nat. Sci. 46, No. 4, 81--87 (2020; Zbl 1474.68027)
Xie, Xiaojun; Ma, Hong; Yang, Fugui; Qiu, Yunlan The BP neural network based on GA optimization in interval fuzzy number time series prediction. (Chinese. English summary) Zbl 1488.62155 J. Qufu Norm. Univ., Nat. Sci. 46, No. 4, 72-76 (2020). MSC: 62M86 62M10 62M20 62M45 PDFBibTeX XMLCite \textit{X. Xie} et al., J. Qufu Norm. Univ., Nat. Sci. 46, No. 4, 72--76 (2020; Zbl 1488.62155)
Li, Yuyan; He, Donglin \({C_{11}}\) modules relative to a torsion theory. (Chinese. English summary) Zbl 1474.16075 J. Qufu Norm. Univ., Nat. Sci. 46, No. 4, 69-71 (2020). MSC: 16S90 16D10 PDFBibTeX XMLCite \textit{Y. Li} and \textit{D. He}, J. Qufu Norm. Univ., Nat. Sci. 46, No. 4, 69--71 (2020; Zbl 1474.16075)
Zhu, Jie; Wang, Peihe Solutions of the curvature equation with Neumann boundary conditions. (Chinese. English summary) Zbl 1474.35422 J. Qufu Norm. Univ., Nat. Sci. 46, No. 4, 59-62 (2020). MSC: 35K93 PDFBibTeX XMLCite \textit{J. Zhu} and \textit{P. Wang}, J. Qufu Norm. Univ., Nat. Sci. 46, No. 4, 59--62 (2020; Zbl 1474.35422)
Tian, Wen; Wang, Peihe Convergence of mean curvature flows with Neumann boundary conditions on two-dimensional Riemannian manifolds. (Chinese. English summary) Zbl 1474.53197 J. Qufu Norm. Univ., Nat. Sci. 46, No. 4, 54-58 (2020). MSC: 53C20 53C21 53E10 PDFBibTeX XMLCite \textit{W. Tian} and \textit{P. Wang}, J. Qufu Norm. Univ., Nat. Sci. 46, No. 4, 54--58 (2020; Zbl 1474.53197)
Yang, Qinghua Statistical inference for joint mean and dispersion in generalized linear models with mixture lognormal distribution. (Chinese. English summary) Zbl 1474.62061 J. Qufu Norm. Univ., Nat. Sci. 46, No. 4, 35-40 (2020). MSC: 62F10 62J12 62H30 PDFBibTeX XMLCite \textit{Q. Yang}, J. Qufu Norm. Univ., Nat. Sci. 46, No. 4, 35--40 (2020; Zbl 1474.62061)
Jiang, Yanru The integer parts of a nonlinear type with mixed powers of integer variables 3, 4 and 5. (Chinese. English summary) Zbl 1474.11020 J. Qufu Norm. Univ., Nat. Sci. 46, No. 4, 29-34 (2020). MSC: 11A41 PDFBibTeX XMLCite \textit{Y. Jiang}, J. Qufu Norm. Univ., Nat. Sci. 46, No. 4, 29--34 (2020; Zbl 1474.11020)
Yin, Li; Huang, Liguo Several double inequalities for the inverse of the generalized polygamma functions. (Chinese. English summary) Zbl 1488.33006 J. Qufu Norm. Univ., Nat. Sci. 46, No. 4, 10-16 (2020). MSC: 33B15 26D15 PDFBibTeX XMLCite \textit{L. Yin} and \textit{L. Huang}, J. Qufu Norm. Univ., Nat. Sci. 46, No. 4, 10--16 (2020; Zbl 1488.33006)
Han, Yuan; Chen, Yan Nucleolus and Shapley value of credibilistic coalitional game. (Chinese. English summary) Zbl 1463.91004 J. Qufu Norm. Univ., Nat. Sci. 46, No. 3, 40-46 (2020). MSC: 91A12 91A86 PDFBibTeX XMLCite \textit{Y. Han} and \textit{Y. Chen}, J. Qufu Norm. Univ., Nat. Sci. 46, No. 3, 40--46 (2020; Zbl 1463.91004)
Feng, Junwei; Liu, Hui; Xin, Jie Pullback attractors of non-autonomous three-component reversible Gray-Scott system on unbounded domains. (Chinese. English summary) Zbl 1463.35102 J. Qufu Norm. Univ., Nat. Sci. 46, No. 3, 35-39 (2020). MSC: 35B41 37C60 37C70 PDFBibTeX XMLCite \textit{J. Feng} et al., J. Qufu Norm. Univ., Nat. Sci. 46, No. 3, 35--39 (2020; Zbl 1463.35102)
Wang, Han; Jiang, Jiqiang Positive solutions to semipositone boundary value problems for fractional differential equations with multi-point boundary conditions. (Chinese. English summary) Zbl 1463.34104 J. Qufu Norm. Univ., Nat. Sci. 46, No. 2, 9-14 (2020). MSC: 34B18 34B10 34A08 47N20 PDFBibTeX XMLCite \textit{H. Wang} and \textit{J. Jiang}, J. Qufu Norm. Univ., Nat. Sci. 46, No. 2, 9--14 (2020; Zbl 1463.34104)
Zong, Bin; Wang, Liguang A note on the perturbation of McDuff factors and factors with property \(\Gamma\). (Chinese. English summary) Zbl 1463.47046 J. Qufu Norm. Univ., Nat. Sci. 46, No. 2, 39-42 (2020). MSC: 47A55 46L05 PDFBibTeX XMLCite \textit{B. Zong} and \textit{L. Wang}, J. Qufu Norm. Univ., Nat. Sci. 46, No. 2, 39--42 (2020; Zbl 1463.47046)
Lv, Jie; Wei, Yuming; Peng, Huaqin Dynamical analysis of stochastic SIS epidemic model with the Beddington-DeAngelis incidence and double diseases. (Chinese. English summary) Zbl 1463.34194 J. Qufu Norm. Univ., Nat. Sci. 46, No. 2, 31-38 (2020). MSC: 34C60 34D20 60H10 92D30 34F05 34D05 PDFBibTeX XMLCite \textit{J. Lv} et al., J. Qufu Norm. Univ., Nat. Sci. 46, No. 2, 31--38 (2020; Zbl 1463.34194)
Yang, Yue; Meng, Fanwei Hyers-Ulam stability of linear differential equations. (Chinese. English summary) Zbl 1463.34042 J. Qufu Norm. Univ., Nat. Sci. 46, No. 2, 15-18 (2020). MSC: 34A30 34D10 37C60 PDFBibTeX XMLCite \textit{Y. Yang} and \textit{F. Meng}, J. Qufu Norm. Univ., Nat. Sci. 46, No. 2, 15--18 (2020; Zbl 1463.34042)
Wang, Shuxin; Wang, Dongxue; Li, Siyu; Wang, Hetong Coloring properties of a class of oblique and diagonal symmetry tangles. (Chinese. English summary) Zbl 1449.57005 J. Qufu Norm. Univ., Nat. Sci. 46, No. 1, 52-55 (2020). MSC: 57M15 05C15 57K10 PDFBibTeX XMLCite \textit{S. Wang} et al., J. Qufu Norm. Univ., Nat. Sci. 46, No. 1, 52--55 (2020; Zbl 1449.57005)
Cao, Xuejing; Wang, Haixia; Li, Tongxing Applications of multi-variable grey model in the prediction of GNP index. (Chinese. English summary) Zbl 1449.91071 J. Qufu Norm. Univ., Nat. Sci. 46, No. 1, 47-51 (2020). MSC: 91B82 PDFBibTeX XMLCite \textit{X. Cao} et al., J. Qufu Norm. Univ., Nat. Sci. 46, No. 1, 47--51 (2020; Zbl 1449.91071)
Wang, Wenqian; Sun, Rui; Chai, Jianhong; Zhou, Yuqun Existence and uniqueness of solutions for boundary value problems of fractional Langevin equation. (Chinese. English summary) Zbl 1449.34034 J. Qufu Norm. Univ., Nat. Sci. 46, No. 1, 40-46 (2020). MSC: 34A08 34B15 34A34 47N20 PDFBibTeX XMLCite \textit{W. Wang} et al., J. Qufu Norm. Univ., Nat. Sci. 46, No. 1, 40--46 (2020; Zbl 1449.34034)
Hu, Jiaming; Miao, Cuixia; Zou, Juan A branch-and-bound algorithm for uniform machines scheduling problem with in-tree precedence constraints. (Chinese. English summary) Zbl 1449.90105 J. Qufu Norm. Univ., Nat. Sci. 46, No. 1, 4-10 (2020). MSC: 90B35 90C57 PDFBibTeX XMLCite \textit{J. Hu} et al., J. Qufu Norm. Univ., Nat. Sci. 46, No. 1, 4--10 (2020; Zbl 1449.90105)
Cheng, Wenjing; Guo, Huaiwen; Chen, Quanguo Globalizations for partial Hom-module coalgebras. (Chinese. English summary) Zbl 1449.16065 J. Qufu Norm. Univ., Nat. Sci. 46, No. 1, 1-3 (2020). MSC: 16T15 PDFBibTeX XMLCite \textit{W. Cheng} et al., J. Qufu Norm. Univ., Nat. Sci. 46, No. 1, 1--3 (2020; Zbl 1449.16065) Full Text: DOI
Fan, Dandan; Du, Jie; Liu, Yang On the maximum signless Laplacian spectral radius of quasi-tree graph. (Chinese. English summary) Zbl 1449.05047 J. Qufu Norm. Univ., Nat. Sci. 45, No. 4, 33-37 (2019). MSC: 05C05 05C50 PDFBibTeX XMLCite \textit{D. Fan} et al., J. Qufu Norm. Univ., Nat. Sci. 45, No. 4, 33--37 (2019; Zbl 1449.05047)
Liu, Jingzhao Application of discharging method in graph colorings theory. (Chinese. English summary) Zbl 1449.05106 J. Qufu Norm. Univ., Nat. Sci. 45, No. 4, 29-32 (2019). MSC: 05C15 PDFBibTeX XMLCite \textit{J. Liu}, J. Qufu Norm. Univ., Nat. Sci. 45, No. 4, 29--32 (2019; Zbl 1449.05106)
Wu, Xiaojie; Xu, Yumei The formation of singularity for the classical solutions to the quasilinear hyperbolic systems with characteristics with constant multiplicity. (Chinese. English summary) Zbl 1449.35005 J. Qufu Norm. Univ., Nat. Sci. 45, No. 4, 23-28 (2019). MSC: 35A09 35L72 35B44 PDFBibTeX XMLCite \textit{X. Wu} and \textit{Y. Xu}, J. Qufu Norm. Univ., Nat. Sci. 45, No. 4, 23--28 (2019; Zbl 1449.35005)
Cheng, Huiyan The locally nonlinear likelihood estimations of the generalized varying-coefficient models. (Chinese. English summary) Zbl 1449.62151 J. Qufu Norm. Univ., Nat. Sci. 45, No. 4, 17-22 (2019). MSC: 62J02 62J12 PDFBibTeX XMLCite \textit{H. Cheng}, J. Qufu Norm. Univ., Nat. Sci. 45, No. 4, 17--22 (2019; Zbl 1449.62151)
He, Donglin; Li, Yuyan Cotorsion theories relative to tilting pairs. (Chinese. English summary) Zbl 1449.16034 J. Qufu Norm. Univ., Nat. Sci. 45, No. 4, 13-16 (2019). MSC: 16G10 16S90 PDFBibTeX XMLCite \textit{D. He} and \textit{Y. Li}, J. Qufu Norm. Univ., Nat. Sci. 45, No. 4, 13--16 (2019; Zbl 1449.16034)
Gao, Fang Diophantine inequality with mixed powers \(1,1,3\) and \(k\). (Chinese. English summary) Zbl 1449.11071 J. Qufu Norm. Univ., Nat. Sci. 45, No. 3, 42-47 (2019). MSC: 11D75 PDFBibTeX XMLCite \textit{F. Gao}, J. Qufu Norm. Univ., Nat. Sci. 45, No. 3, 42--47 (2019; Zbl 1449.11071)
Liu, Jiangting; Chen, Yan TOPSIS approach based on interval-valued intuitionistic fuzzy values with Choquet integral operator. (Chinese. English summary) Zbl 1449.90176 J. Qufu Norm. Univ., Nat. Sci. 45, No. 3, 35-41 (2019). MSC: 90B50 03E72 PDFBibTeX XMLCite \textit{J. Liu} and \textit{Y. Chen}, J. Qufu Norm. Univ., Nat. Sci. 45, No. 3, 35--41 (2019; Zbl 1449.90176)
Zhang, Xue; Yu, Xiangyu Anisotropic denoising model based on adaptive gradient threshold. (Chinese. English summary) Zbl 1449.94026 J. Qufu Norm. Univ., Nat. Sci. 45, No. 3, 27-34 (2019). MSC: 94A08 PDFBibTeX XMLCite \textit{X. Zhang} and \textit{X. Yu}, J. Qufu Norm. Univ., Nat. Sci. 45, No. 3, 27--34 (2019; Zbl 1449.94026)
Chen, Jie; Yu, Yong; Shen, Ying; Liu, Jianmei The expected discounted penalty function of a risk model with linear dividend barrier. (Chinese. English summary) Zbl 1449.91096 J. Qufu Norm. Univ., Nat. Sci. 45, No. 3, 23-26 (2019). MSC: 91G05 45K05 PDFBibTeX XMLCite \textit{J. Chen} et al., J. Qufu Norm. Univ., Nat. Sci. 45, No. 3, 23--26 (2019; Zbl 1449.91096)
Li, Shiyu; Zhou, Hainan; Shen, Wenjie; Chen, Huixiang Pseudo-unitary matrices and the \(*\)-structures of Radford algebra. (Chinese. English summary) Zbl 1449.15047 J. Qufu Norm. Univ., Nat. Sci. 45, No. 3, 19-22 (2019). MSC: 15A30 16T05 PDFBibTeX XMLCite \textit{S. Li} et al., J. Qufu Norm. Univ., Nat. Sci. 45, No. 3, 19--22 (2019; Zbl 1449.15047)
Quan, Weizhen; Li, Xiaopei; Ma, Xiuxian; Zeng, Yongjun; Liu, Linniang; Liu, Qiuju Asymptotic stability of a class of second order difference equation. (Chinese. English summary) Zbl 1449.39022 J. Qufu Norm. Univ., Nat. Sci. 45, No. 3, 15-18 (2019). MSC: 39A30 PDFBibTeX XMLCite \textit{W. Quan} et al., J. Qufu Norm. Univ., Nat. Sci. 45, No. 3, 15--18 (2019; Zbl 1449.39022)
Miao, Fahe; Liu, Hui; Xin, Jie Convergence of attractors and invariant measures for a \(p\)-Laplace equation in \(\mathbb{R}^n\). (Chinese. English summary) Zbl 1449.35096 J. Qufu Norm. Univ., Nat. Sci. 45, No. 3, 1-6 (2019). MSC: 35B41 37L30 PDFBibTeX XMLCite \textit{F. Miao} et al., J. Qufu Norm. Univ., Nat. Sci. 45, No. 3, 1--6 (2019; Zbl 1449.35096)
He, Chaobing; Wei, Chao Continuous transformation methods of discrete random variables. (Chinese. English summary) Zbl 1438.60016 J. Qufu Norm. Univ., Nat. Sci. 45, No. 2, 52-56 (2019). MSC: 60E10 PDFBibTeX XMLCite \textit{C. He} and \textit{C. Wei}, J. Qufu Norm. Univ., Nat. Sci. 45, No. 2, 52--56 (2019; Zbl 1438.60016)
Huang, Xinli The stability of \((C,C^{\prime} )\)-controlled \(K\text{-}g\)-frames. (Chinese. English summary) Zbl 1438.42064 J. Qufu Norm. Univ., Nat. Sci. 45, No. 2, 43-46 (2019). MSC: 42C15 46C15 PDFBibTeX XMLCite \textit{X. Huang}, J. Qufu Norm. Univ., Nat. Sci. 45, No. 2, 43--46 (2019; Zbl 1438.42064)
Wu, Bangkun Rota-Baxter algebras contructed by cycle matrices. (Chinese. English summary) Zbl 1438.16062 J. Qufu Norm. Univ., Nat. Sci. 45, No. 2, 39-42 (2019). MSC: 16T30 PDFBibTeX XMLCite \textit{B. Wu}, J. Qufu Norm. Univ., Nat. Sci. 45, No. 2, 39--42 (2019; Zbl 1438.16062)
Sun, Shuiling Stability of singular large-scale linear control systems. (Chinese. English summary) Zbl 1438.93181 J. Qufu Norm. Univ., Nat. Sci. 45, No. 2, 33-38 (2019). MSC: 93D05 93A15 93C05 PDFBibTeX XMLCite \textit{S. Sun}, J. Qufu Norm. Univ., Nat. Sci. 45, No. 2, 33--38 (2019; Zbl 1438.93181)
Huang, Haiyan; Wang, Peihe Estimation and convergence of solutions of curvature equations with Neumann boundary value. (Chinese. English summary) Zbl 1438.35239 J. Qufu Norm. Univ., Nat. Sci. 45, No. 2, 27-32 (2019). MSC: 35K59 53C42 PDFBibTeX XMLCite \textit{H. Huang} and \textit{P. Wang}, J. Qufu Norm. Univ., Nat. Sci. 45, No. 2, 27--32 (2019; Zbl 1438.35239)
Kong, Xianfen On the characteristics and enlightenment of derivative concept interpretation in Harvard calculus textbooks. (Chinese. English summary) Zbl 1438.97001 J. Qufu Norm. Univ., Nat. Sci. 45, No. 2, 126-128 (2019). MSC: 97U20 PDFBibTeX XMLCite \textit{X. Kong}, J. Qufu Norm. Univ., Nat. Sci. 45, No. 2, 126--128 (2019; Zbl 1438.97001)
Zhang, Feng; Qian, Yanyun Oscillation criteria for solutions of a class of higher order quasilinear neutral delay differential equations. (Chinese. English summary) Zbl 1438.34233 J. Qufu Norm. Univ., Nat. Sci. 45, No. 1, 51-57 (2019). MSC: 34K11 34K40 PDFBibTeX XMLCite \textit{F. Zhang} and \textit{Y. Qian}, J. Qufu Norm. Univ., Nat. Sci. 45, No. 1, 51--57 (2019; Zbl 1438.34233)
Zhang, Jixin \(\mathscr{M}_n^k\) graphs with maximal Merrifield-Simmons index. (Chinese. English summary) Zbl 1438.05078 J. Qufu Norm. Univ., Nat. Sci. 45, No. 1, 47-50 (2019). MSC: 05C09 05C35 05C30 PDFBibTeX XMLCite \textit{J. Zhang}, J. Qufu Norm. Univ., Nat. Sci. 45, No. 1, 47--50 (2019; Zbl 1438.05078)
Song, Xiaoping; Meng, Fanwei Nonlinear Volterra-Fredholm integral inequality with two variables. (Chinese. English summary) Zbl 1438.26100 J. Qufu Norm. Univ., Nat. Sci. 45, No. 1, 33-42 (2019). MSC: 26D15 PDFBibTeX XMLCite \textit{X. Song} and \textit{F. Meng}, J. Qufu Norm. Univ., Nat. Sci. 45, No. 1, 33--42 (2019; Zbl 1438.26100)
Li, Yincan; Liang, Xiaodong Topological based on distance indices of some chemical graphs. (Chinese. English summary) Zbl 1438.05061 J. Qufu Norm. Univ., Nat. Sci. 45, No. 1, 23-27 (2019). MSC: 05C09 05C12 05C35 05C92 PDFBibTeX XMLCite \textit{Y. Li} and \textit{X. Liang}, J. Qufu Norm. Univ., Nat. Sci. 45, No. 1, 23--27 (2019; Zbl 1438.05061)
Wang, Dan Application of extended Riccati equation rational expansion method in \((2 + 1)\)-dimensional Burgers equation. (Chinese. English summary) Zbl 1424.35306 J. Qufu Norm. Univ., Nat. Sci. 44, No. 4, 5-8 (2018). MSC: 35Q53 35A25 PDFBibTeX XMLCite \textit{D. Wang}, J. Qufu Norm. Univ., Nat. Sci. 44, No. 4, 5--8 (2018; Zbl 1424.35306)
Wang, Zhenzhen; Liu, Yanhao; Gao, Miaomiao; Sun, Qingying A new non-monotone self adaptive trust region method based on modified quasi-Newton equation for nonlinear equations. (Chinese. English summary) Zbl 1424.65069 J. Qufu Norm. Univ., Nat. Sci. 44, No. 4, 28-36 (2018). MSC: 65H10 PDFBibTeX XMLCite \textit{Z. Wang} et al., J. Qufu Norm. Univ., Nat. Sci. 44, No. 4, 28--36 (2018; Zbl 1424.65069)
Fang, Hongyan; Wang, Rui; Yang, Wenzhi; Hu, Futao Deep mining of Bayes formula teaching. (Chinese. English summary) Zbl 1424.97002 J. Qufu Norm. Univ., Nat. Sci. 44, No. 4, 1-4 (2018). MSC: 97K70 PDFBibTeX XMLCite \textit{H. Fang} et al., J. Qufu Norm. Univ., Nat. Sci. 44, No. 4, 1--4 (2018; Zbl 1424.97002)
Lei, Tengfei Dynamics analysis and circuit implementation of fractional-order Chen chaotic system with time-delay. (Chinese. English summary) Zbl 1424.37054 J. Qufu Norm. Univ., Nat. Sci. 44, No. 3, 59-65 (2018). MSC: 37N99 94C05 26A33 34K37 37D45 PDFBibTeX XMLCite \textit{T. Lei}, J. Qufu Norm. Univ., Nat. Sci. 44, No. 3, 59--65 (2018; Zbl 1424.37054)
Wang, Ling Knowledge reduction algorithm of interval-valued inconsistent information systems based on variable precision dominance relation. (Chinese. English summary) Zbl 1424.68168 J. Qufu Norm. Univ., Nat. Sci. 44, No. 3, 41-47 (2018). MSC: 68T30 68T37 PDFBibTeX XMLCite \textit{L. Wang}, J. Qufu Norm. Univ., Nat. Sci. 44, No. 3, 41--47 (2018; Zbl 1424.68168)
Yao, Yuedan; Liu, Muhuo; Ye, Jiachang Extremal results of trees, unicyclic graphs and bicyclic graphs of chemical index based on vertex-degree. (Chinese. English summary) Zbl 1424.05052 J. Qufu Norm. Univ., Nat. Sci. 44, No. 3, 4-10 (2018). MSC: 05C05 05C07 05C35 05C90 92E10 PDFBibTeX XMLCite \textit{Y. Yao} et al., J. Qufu Norm. Univ., Nat. Sci. 44, No. 3, 4--10 (2018; Zbl 1424.05052)
Yang, Wei; Zhang, Jing; Guo, Qing On the atom-bond connectivity index of unicyclic graphs with \(k\) pendant vertices. (Chinese. English summary) Zbl 1424.05160 J. Qufu Norm. Univ., Nat. Sci. 44, No. 3, 33-37 (2018). MSC: 05C35 05C40 05C90 92E10 PDFBibTeX XMLCite \textit{W. Yang} et al., J. Qufu Norm. Univ., Nat. Sci. 44, No. 3, 33--37 (2018; Zbl 1424.05160)
Liu, Huiran; Guo, Sainan; Ma, Ran An alternative proof of an optimal online algorithm for single-machine scheduling with deteriorating jobs. (Chinese. English summary) Zbl 1424.90078 J. Qufu Norm. Univ., Nat. Sci. 44, No. 3, 1-3 (2018). MSC: 90B35 68W27 PDFBibTeX XMLCite \textit{H. Liu} et al., J. Qufu Norm. Univ., Nat. Sci. 44, No. 3, 1--3 (2018; Zbl 1424.90078)
Guo, Weiwei; Liu, Feng; Tian, Tiegang; Yang, Xinnian A dynamic resource scheduling strategy based on response and resource status update time. (Chinese. English summary) Zbl 1413.68011 J. Qufu Norm. Univ., Nat. Sci. 44, No. 2, 54-58 (2018). MSC: 68M20 90B35 PDFBibTeX XMLCite \textit{W. Guo} et al., J. Qufu Norm. Univ., Nat. Sci. 44, No. 2, 54--58 (2018; Zbl 1413.68011)
Xie, Mingchao; Han, Xu; Luan, Shuai; Li, Fang; Wang, Chunxing Brain tumor segmentation using convolutional neural networks feature extraction in MRI images. (Chinese. English summary) Zbl 1413.92016 J. Qufu Norm. Univ., Nat. Sci. 44, No. 2, 49-53 (2018). MSC: 92C55 68T05 68T10 PDFBibTeX XMLCite \textit{M. Xie} et al., J. Qufu Norm. Univ., Nat. Sci. 44, No. 2, 49--53 (2018; Zbl 1413.92016)
Wu, You; Sun, Weiwei Adaptive control of strict-feedback systems with unknown control coefficient and asymmetric time-varying full state constraints. (Chinese. English summary) Zbl 1413.93064 J. Qufu Norm. Univ., Nat. Sci. 44, No. 2, 28-38 (2018). MSC: 93C40 93B52 93C10 PDFBibTeX XMLCite \textit{Y. Wu} and \textit{W. Sun}, J. Qufu Norm. Univ., Nat. Sci. 44, No. 2, 28--38 (2018; Zbl 1413.93064)
Qin, Yangyang; Zhang, Yuzhong; Ren, Jianfeng Allocation game on \(m\)-uniform parallel machines. (Chinese. English summary) Zbl 1413.91007 J. Qufu Norm. Univ., Nat. Sci. 44, No. 2, 17-20 (2018). MSC: 91A10 91B32 90B35 PDFBibTeX XMLCite \textit{Y. Qin} et al., J. Qufu Norm. Univ., Nat. Sci. 44, No. 2, 17--20 (2018; Zbl 1413.91007)
Chen, Liang; Bai, Qingguo; Qu, Biao Study of financing mechanism and strategy for supply chains with stochastic demands. (Chinese. English summary) Zbl 1413.90114 J. Qufu Norm. Univ., Nat. Sci. 44, No. 2, 10-16 (2018). MSC: 90B50 91B06 90B05 PDFBibTeX XMLCite \textit{L. Chen} et al., J. Qufu Norm. Univ., Nat. Sci. 44, No. 2, 10--16 (2018; Zbl 1413.90114)
Zhang, Yusheng; Cui, Xinchun; Han, Yingshuai; Xu, Tingting An optimized LWT-SVD domain gray image digital watermarking algorithm. (Chinese. English summary) Zbl 1413.94020 J. Qufu Norm. Univ., Nat. Sci. 44, No. 1, 54-60 (2018). MSC: 94A08 94A60 PDFBibTeX XMLCite \textit{Y. Zhang} et al., J. Qufu Norm. Univ., Nat. Sci. 44, No. 1, 54--60 (2018; Zbl 1413.94020)
Liu, Wenchao; Zhu, Yongzhi; Wang, Sifeng A parallel collaborative filtering recommendation algorithm based on MapReduce. (Chinese. English summary) Zbl 1413.68173 J. Qufu Norm. Univ., Nat. Sci. 44, No. 1, 50-53 (2018). MSC: 68U35 68P10 PDFBibTeX XMLCite \textit{W. Liu} et al., J. Qufu Norm. Univ., Nat. Sci. 44, No. 1, 50--53 (2018; Zbl 1413.68173)
Zhao, Yuqi; Zhang, Ying Modeling of optimization of express enterprise personnel assignment based on stock profit and solution. (Chinese. English summary) Zbl 1413.90108 J. Qufu Norm. Univ., Nat. Sci. 44, No. 1, 45-49 (2018). MSC: 90B36 90C59 65K05 PDFBibTeX XMLCite \textit{Y. Zhao} and \textit{Y. Zhang}, J. Qufu Norm. Univ., Nat. Sci. 44, No. 1, 45--49 (2018; Zbl 1413.90108)
Wan, Fei; Du, Xiancun The positive integer point on the elliptic curve \({y^2} = nx\left ( {{x^2} + 8} \right)\). (Chinese. English summary) Zbl 1413.11082 J. Qufu Norm. Univ., Nat. Sci. 44, No. 1, 42-44 (2018). MSC: 11G05 11G07 14H52 PDFBibTeX XMLCite \textit{F. Wan} and \textit{X. Du}, J. Qufu Norm. Univ., Nat. Sci. 44, No. 1, 42--44 (2018; Zbl 1413.11082)
Cui, Shiqi; Geng, Liyuan Diophantine approximation with prime variables and mixed power. (Chinese. English summary) Zbl 1413.11086 J. Qufu Norm. Univ., Nat. Sci. 44, No. 1, 36-41, 44 (2018). MSC: 11J25 11D75 PDFBibTeX XMLCite \textit{S. Cui} and \textit{L. Geng}, J. Qufu Norm. Univ., Nat. Sci. 44, No. 1, 36--41, 44 (2018; Zbl 1413.11086)
Li, Yulong; Wan, Fei On integer solution of the Diophantine equation \({x^3} - 1 = 3P{y^2}\). (Chinese. English summary) Zbl 1413.11065 J. Qufu Norm. Univ., Nat. Sci. 44, No. 1, 25-28, 35 (2018). MSC: 11D25 PDFBibTeX XMLCite \textit{Y. Li} and \textit{F. Wan}, J. Qufu Norm. Univ., Nat. Sci. 44, No. 1, 25--28, 35 (2018; Zbl 1413.11065)
Wang, Shuxin; Sun, Pingshuang; Lu, Shuo Essential closed surfaces in a class of the self-annular sum of \(I\)-bundles of closed surface. (Chinese. English summary) Zbl 1413.57006 J. Qufu Norm. Univ., Nat. Sci. 44, No. 1, 17-19 (2018). MSC: 57N10 57M27 57M30 PDFBibTeX XMLCite \textit{S. Wang} et al., J. Qufu Norm. Univ., Nat. Sci. 44, No. 1, 17--19 (2018; Zbl 1413.57006)
Shi, Hongwei; Bai, Yuzhen On the oscillation for a kind of second order neutral delay differential equations. (Chinese. English summary) Zbl 1399.34197 J. Qufu Norm. Univ., Nat. Sci. 43, No. 4, 8-14 (2017). MSC: 34K11 34K40 PDFBibTeX XMLCite \textit{H. Shi} and \textit{Y. Bai}, J. Qufu Norm. Univ., Nat. Sci. 43, No. 4, 8--14 (2017; Zbl 1399.34197)
Liu, Feng; Guo, Weiwei; Zhang, Yan; Tang, Taiqing; Li, Xiaoyan Research and design of an improved grid task scheduling model based on hierarchical structure. (Chinese. English summary) Zbl 1399.90099 J. Qufu Norm. Univ., Nat. Sci. 43, No. 4, 39-42 (2017). MSC: 90B35 90B10 68Q85 PDFBibTeX XMLCite \textit{F. Liu} et al., J. Qufu Norm. Univ., Nat. Sci. 43, No. 4, 39--42 (2017; Zbl 1399.90099)
Zhao, Xiaodong A new error on the Perron formula. (Chinese. English summary) Zbl 1399.11159 J. Qufu Norm. Univ., Nat. Sci. 43, No. 4, 32-34, 38 (2017). MSC: 11M41 PDFBibTeX XMLCite \textit{X. Zhao}, J. Qufu Norm. Univ., Nat. Sci. 43, No. 4, 32--34, 38 (2017; Zbl 1399.11159)
Zhao, Jianhong The integral points on the elliptic curve \({y^2} = px\left ( {{x^2} + 128} \right)\). (Chinese. English summary) Zbl 1399.11118 J. Qufu Norm. Univ., Nat. Sci. 43, No. 4, 21-24 (2017). MSC: 11G05 11G07 14H52 PDFBibTeX XMLCite \textit{J. Zhao}, J. Qufu Norm. Univ., Nat. Sci. 43, No. 4, 21--24 (2017; Zbl 1399.11118) Full Text: DOI
Wang, Yang Anti-disturbance control of uncertain switched system with input saturation. (Chinese. English summary) Zbl 1389.93207 J. Qufu Norm. Univ., Nat. Sci. 43, No. 3, 54-58 (2017). MSC: 93D21 93B35 93C30 93C41 93D30 93C10 PDFBibTeX XMLCite \textit{Y. Wang}, J. Qufu Norm. Univ., Nat. Sci. 43, No. 3, 54--58 (2017; Zbl 1389.93207)
Lei, Tengfei; Liu, Yanfen; Chen, Zhongqi; Mi, Weiyu; Guo, Liyuan; Chen, Heng Dynamics analysis, circuit simulation and application for a new chaotic systems with existence of multiple attractors. (Chinese. English summary) Zbl 1389.37019 J. Qufu Norm. Univ., Nat. Sci. 43, No. 3, 35-43 (2017). MSC: 37D45 94C99 PDFBibTeX XMLCite \textit{T. Lei} et al., J. Qufu Norm. Univ., Nat. Sci. 43, No. 3, 35--43 (2017; Zbl 1389.37019)
Bi, Huili; Wang, Qingxue; Zhao, Shengli Influence of fixed assets investment on economic growth. (Chinese. English summary) Zbl 1389.62170 J. Qufu Norm. Univ., Nat. Sci. 43, No. 3, 25-30 (2017). MSC: 62P20 91B62 62H20 62M07 PDFBibTeX XMLCite \textit{H. Bi} et al., J. Qufu Norm. Univ., Nat. Sci. 43, No. 3, 25--30 (2017; Zbl 1389.62170)
Wang, Dongxia; Qin, Qiong Reliability comparison of the hypercube and crossed cube. (Chinese. English summary) Zbl 1389.90064 J. Qufu Norm. Univ., Nat. Sci. 43, No. 3, 22-24 (2017). MSC: 90B10 05C82 90B25 PDFBibTeX XMLCite \textit{D. Wang} and \textit{Q. Qin}, J. Qufu Norm. Univ., Nat. Sci. 43, No. 3, 22--24 (2017; Zbl 1389.90064)
Qiu, Leipin; Jiang, Lanqing The Bayesian estimation for the generalized exponential distribution in censored life testing. (Chinese. English summary) Zbl 1389.62048 J. Qufu Norm. Univ., Nat. Sci. 43, No. 3, 17-21 (2017). MSC: 62F15 62N05 PDFBibTeX XMLCite \textit{L. Qiu} and \textit{L. Jiang}, J. Qufu Norm. Univ., Nat. Sci. 43, No. 3, 17--21 (2017; Zbl 1389.62048)
Xu, Jianteng; Zheng, Chunhua Pricing strategy for a logistics service provider with learning effect. (Chinese. English summary) Zbl 1389.90056 J. Qufu Norm. Univ., Nat. Sci. 43, No. 3, 11-16 (2017). MSC: 90B06 90B50 91B25 65K10 PDFBibTeX XMLCite \textit{J. Xu} and \textit{C. Zheng}, J. Qufu Norm. Univ., Nat. Sci. 43, No. 3, 11--16 (2017; Zbl 1389.90056)