Akrotirianakis, I. G.; Gratton, M.; Griffin, J. D.; Yektamaram, S.; Zhou, W. Simultaneous iterative solutions for the trust-region and minimum eigenvalue subproblem. (English) Zbl 1501.90070 Optim. Methods Softw. 37, No. 2, 692-711 (2022). MSC: 90C26 90C56 65K05 49M37 PDFBibTeX XMLCite \textit{I. G. Akrotirianakis} et al., Optim. Methods Softw. 37, No. 2, 692--711 (2022; Zbl 1501.90070) Full Text: DOI
Jia, Xiaojing; Liang, Xin; Shen, Chungen; Zhang, Lei-Hong Solving the cubic regularization model by a nested restarting Lanczos method. (English) Zbl 1489.90183 SIAM J. Matrix Anal. Appl. 43, No. 2, 812-839 (2022). MSC: 90C30 90C06 90C53 65K05 65F15 PDFBibTeX XMLCite \textit{X. Jia} et al., SIAM J. Matrix Anal. Appl. 43, No. 2, 812--839 (2022; Zbl 1489.90183) Full Text: DOI
Zeng, Liaoyuan; Pong, Ting Kei \(\rho\)-regularization subproblems: strong duality and an eigensolver-based algorithm. (English) Zbl 1487.90609 Comput. Optim. Appl. 81, No. 2, 337-368 (2022). MSC: 90C30 90C46 PDFBibTeX XMLCite \textit{L. Zeng} and \textit{T. K. Pong}, Comput. Optim. Appl. 81, No. 2, 337--368 (2022; Zbl 1487.90609) Full Text: DOI arXiv
Jia, Zhongxiao; Wang, Fa The convergence of the generalized Lanczos trust-region method for the trust-region subproblem. (English) Zbl 1462.90083 SIAM J. Optim. 31, No. 1, 887-914 (2021). MSC: 90C20 90C30 65K05 65F10 PDFBibTeX XMLCite \textit{Z. Jia} and \textit{F. Wang}, SIAM J. Optim. 31, No. 1, 887--914 (2021; Zbl 1462.90083) Full Text: DOI arXiv
Bruni, V.; Della Cioppa, L.; Vitulano, D. An automatic and parameter-free information-based method for sparse representation in wavelet bases. (English) Zbl 1510.65336 Math. Comput. Simul. 176, 73-95 (2020). MSC: 65T60 41A45 94A08 94A12 PDFBibTeX XMLCite \textit{V. Bruni} et al., Math. Comput. Simul. 176, 73--95 (2020; Zbl 1510.65336) Full Text: DOI
Chieu, Nguyen Huy; Van Hien, Le; Trang, Nguyen Thi Quynh Tilt stability for quadratic programs with one or two quadratic inequality constraints. (English) Zbl 1453.90111 Acta Math. Vietnam. 45, No. 2, 477-499 (2020). MSC: 90C20 90C31 90C46 PDFBibTeX XMLCite \textit{N. H. Chieu} et al., Acta Math. Vietnam. 45, No. 2, 477--499 (2020; Zbl 1453.90111) Full Text: DOI
Erway, Jennifer B.; Griffin, Joshua; Marcia, Roummel F.; Omheni, Riadh Trust-region algorithms for training responses: machine learning methods using indefinite Hessian approximations. (English) Zbl 1440.90092 Optim. Methods Softw. 35, No. 3, 460-487 (2020). MSC: 90C53 15A06 90C06 65K05 65K10 49M15 PDFBibTeX XMLCite \textit{J. B. Erway} et al., Optim. Methods Softw. 35, No. 3, 460--487 (2020; Zbl 1440.90092) Full Text: DOI arXiv
Gao, Guohua; Jiang, Hao; Vink, Jeroen C.; van Hagen, Paul P. H.; Wells, Terence J. Performance enhancement of Gauss-Newton trust-region solver for distributed Gauss-Newton optimization method. (English) Zbl 1434.90211 Comput. Geosci. 24, No. 2, 837-852 (2020). MSC: 90C39 90C20 86A22 90C55 PDFBibTeX XMLCite \textit{G. Gao} et al., Comput. Geosci. 24, No. 2, 837--852 (2020; Zbl 1434.90211) Full Text: DOI
Taati, Akram; Salahi, Maziar On local non-global minimizers of quadratic optimization problem with a single quadratic constraint. (English) Zbl 1464.90052 Numer. Funct. Anal. Optim. 41, No. 8, 969-1005 (2020). MSC: 90C20 90C26 PDFBibTeX XMLCite \textit{A. Taati} and \textit{M. Salahi}, Numer. Funct. Anal. Optim. 41, No. 8, 969--1005 (2020; Zbl 1464.90052) Full Text: DOI
Brás, C. P.; Martínez, J. M.; Raydan, M. Large-scale unconstrained optimization using separable cubic modeling and matrix-free subspace minimization. (English) Zbl 1432.90119 Comput. Optim. Appl. 75, No. 1, 169-205 (2020). MSC: 90C26 65K10 90C06 PDFBibTeX XMLCite \textit{C. P. Brás} et al., Comput. Optim. Appl. 75, No. 1, 169--205 (2020; Zbl 1432.90119) Full Text: DOI Link
Gould, Nicholas I. M.; Simoncini, Valeria Error estimates for iterative algorithms for minimizing regularized quadratic subproblems. (English) Zbl 1428.90160 Optim. Methods Softw. 35, No. 2, 304-328 (2020). MSC: 90C30 65K05 90C20 PDFBibTeX XMLCite \textit{N. I. M. Gould} and \textit{V. Simoncini}, Optim. Methods Softw. 35, No. 2, 304--328 (2020; Zbl 1428.90160) Full Text: DOI Link
Taati, A.; Salahi, M. A conjugate gradient-based algorithm for large-scale quadratic programming problem with one quadratic constraint. (English) Zbl 1427.90210 Comput. Optim. Appl. 74, No. 1, 195-223 (2019). MSC: 90C20 90C06 90C52 PDFBibTeX XMLCite \textit{A. Taati} and \textit{M. Salahi}, Comput. Optim. Appl. 74, No. 1, 195--223 (2019; Zbl 1427.90210) Full Text: DOI arXiv
Adachi, Satoru; Nakatsukasa, Yuji Eigenvalue-based algorithm and analysis for nonconvex QCQP with one constraint. (English) Zbl 1411.90246 Math. Program. 173, No. 1-2 (A), 79-116 (2019). MSC: 90C20 90C30 65K05 PDFBibTeX XMLCite \textit{S. Adachi} and \textit{Y. Nakatsukasa}, Math. Program. 173, No. 1--2 (A), 79--116 (2019; Zbl 1411.90246) Full Text: DOI
Zhou, W.; Akrotirianakis, I. G.; Yektamaram, S.; Griffin, J. D. A matrix-free line-search algorithm for nonconvex optimization. (English) Zbl 1416.90023 Optim. Methods Softw. 34, No. 1, 1-24 (2019). MSC: 90C06 90C26 90C30 65K05 68T01 PDFBibTeX XMLCite \textit{W. Zhou} et al., Optim. Methods Softw. 34, No. 1, 1--24 (2019; Zbl 1416.90023) Full Text: DOI
Kolvenbach, Philip; Lass, Oliver; Ulbrich, Stefan An approach for robust PDE-constrained optimization with application to shape optimization of electrical engines and of dynamic elastic structures under uncertainty. (English) Zbl 1507.49020 Optim. Eng. 19, No. 3, 697-731 (2018). MSC: 49K20 35Q74 49K35 74P20 PDFBibTeX XMLCite \textit{P. Kolvenbach} et al., Optim. Eng. 19, No. 3, 697--731 (2018; Zbl 1507.49020) Full Text: DOI
Zhang, Leihong; Yang, Weihong; Shen, Chungen; Feng, Jiang Error bounds of Lanczos approach for trust-region subproblem. (English) Zbl 1392.90088 Front. Math. China 13, No. 2, 459-481 (2018). MSC: 90C20 90C06 65F10 65F15 65F35 PDFBibTeX XMLCite \textit{L. Zhang} et al., Front. Math. China 13, No. 2, 459--481 (2018; Zbl 1392.90088) Full Text: DOI
Zhang, Lei-Hong; Shen, Chungen A nested Lanczos method for the trust-region subproblem. (English) Zbl 1402.90113 SIAM J. Sci. Comput. 40, No. 4, A2005-A2032 (2018). MSC: 90C20 90C06 65F10 65F15 65K05 PDFBibTeX XMLCite \textit{L.-H. Zhang} and \textit{C. Shen}, SIAM J. Sci. Comput. 40, No. 4, A2005--A2032 (2018; Zbl 1402.90113) Full Text: DOI
Beck, Amir; Vaisbourd, Yakov Globally solving the trust region subproblem using simple first-order methods. (English) Zbl 1455.90104 SIAM J. Optim. 28, No. 3, 1951-1967 (2018). Reviewer: Nicolae Popovici (Cluj-Napoca) MSC: 90C06 90C26 90C46 PDFBibTeX XMLCite \textit{A. Beck} and \textit{Y. Vaisbourd}, SIAM J. Optim. 28, No. 3, 1951--1967 (2018; Zbl 1455.90104) Full Text: DOI
Lenders, Felix; Kirches, C.; Potschka, A. trlib: a vector-free implementation of the GLTR method for iterative solution of the trust region problem. (English) Zbl 1390.35364 Optim. Methods Softw. 33, No. 3, 420-449 (2018). MSC: 35Q90 65K05 90C20 90C30 PDFBibTeX XMLCite \textit{F. Lenders} et al., Optim. Methods Softw. 33, No. 3, 420--449 (2018; Zbl 1390.35364) Full Text: DOI arXiv
Zhang, Lei-Hong; Shen, Chungen; Yang, Wei Hong; Júdice, Joaquim J. A Lanczos method for large-scale extreme Lorentz eigenvalue problems. (English) Zbl 1390.90543 SIAM J. Matrix Anal. Appl. 39, No. 2, 611-631 (2018). MSC: 90C33 47J20 15A18 90C06 65F15 PDFBibTeX XMLCite \textit{L.-H. Zhang} et al., SIAM J. Matrix Anal. Appl. 39, No. 2, 611--631 (2018; Zbl 1390.90543) Full Text: DOI
Zhang, Lei-Hong; Shen, Chungen; Li, Ren-Cang On the generalized Lanczos trust-region method. (English) Zbl 1380.90210 SIAM J. Optim. 27, No. 3, 2110-2142 (2017). MSC: 90C20 90C06 65F10 65F15 65F35 PDFBibTeX XMLCite \textit{L.-H. Zhang} et al., SIAM J. Optim. 27, No. 3, 2110--2142 (2017; Zbl 1380.90210) Full Text: DOI
Ho-Nguyen, Nam; Kilinç-Karzan, Fatma A second-order cone based approach for solving the trust-region subproblem and its variants. (English) Zbl 1370.90170 SIAM J. Optim. 27, No. 3, 1485-1512 (2017). MSC: 90C20 90C25 90C26 90C30 PDFBibTeX XMLCite \textit{N. Ho-Nguyen} and \textit{F. Kilinç-Karzan}, SIAM J. Optim. 27, No. 3, 1485--1512 (2017; Zbl 1370.90170) Full Text: DOI arXiv
Birgin, E. G.; Martínez, J. M. The use of quadratic regularization with a cubic descent condition for unconstrained optimization. (English) Zbl 1370.90260 SIAM J. Optim. 27, No. 2, 1049-1074 (2017). MSC: 90C30 65K05 49M37 90C60 68Q25 PDFBibTeX XMLCite \textit{E. G. Birgin} and \textit{J. M. Martínez}, SIAM J. Optim. 27, No. 2, 1049--1074 (2017; Zbl 1370.90260) Full Text: DOI
Brust, Johannes; Erway, Jennifer B.; Marcia, Roummel F. On solving L-SR1 trust-region subproblems. (English) Zbl 1364.90239 Comput. Optim. Appl. 66, No. 2, 245-266 (2017). MSC: 90C20 65K05 PDFBibTeX XMLCite \textit{J. Brust} et al., Comput. Optim. Appl. 66, No. 2, 245--266 (2017; Zbl 1364.90239) Full Text: DOI arXiv
Salahi, Maziar; Taati, Akram; Wolkowicz, Henry Local nonglobal minima for solving large-scale extended trust-region subproblems. (English) Zbl 1391.90496 Comput. Optim. Appl. 66, No. 2, 223-244 (2017). MSC: 90C26 90C30 90C46 65F15 PDFBibTeX XMLCite \textit{M. Salahi} et al., Comput. Optim. Appl. 66, No. 2, 223--244 (2017; Zbl 1391.90496) Full Text: DOI arXiv
Adachi, Satoru; Iwata, Satoru; Nakatsukasa, Yuji; Takeda, Akiko Solving the trust-region subproblem by a generalized eigenvalue problem. (English) Zbl 1359.49009 SIAM J. Optim. 27, No. 1, 269-291 (2017). MSC: 49M37 65K10 90C25 90C30 PDFBibTeX XMLCite \textit{S. Adachi} et al., SIAM J. Optim. 27, No. 1, 269--291 (2017; Zbl 1359.49009) Full Text: DOI
Hazan, Elad; Koren, Tomer A linear-time algorithm for trust region problems. (English) Zbl 1346.90654 Math. Program. 158, No. 1-2 (A), 363-381 (2016). MSC: 90C20 90C22 90C26 68W25 PDFBibTeX XMLCite \textit{E. Hazan} and \textit{T. Koren}, Math. Program. 158, No. 1--2 (A), 363--381 (2016; Zbl 1346.90654) Full Text: DOI arXiv
Sirković, Petar; Kressner, Daniel Subspace acceleration for large-scale parameter-dependent Hermitian eigenproblems. (English) Zbl 1382.65104 SIAM J. Matrix Anal. Appl. 37, No. 2, 695-718 (2016). MSC: 65F15 15B57 15A18 47A55 PDFBibTeX XMLCite \textit{P. Sirković} and \textit{D. Kressner}, SIAM J. Matrix Anal. Appl. 37, No. 2, 695--718 (2016; Zbl 1382.65104) Full Text: DOI arXiv
Chen, Yi; Gao, David Yang Canonical dual approach for minimizing a nonconvex quadratic function over a sphere. (English) Zbl 1327.90164 Gao, David (ed.) et al., Advances in global optimization. Selected papers based on the presentations at the 3rd world congress on global optimization in engineering and science, WCGO, Anhui, China, July 8–12, 2013. Cham: Springer (ISBN 978-3-319-08376-6/hbk; 978-3-319-08377-3/ebook). Springer Proceedings in Mathematics & Statistics 95, 149-156 (2015). MSC: 90C20 90C26 90C46 PDFBibTeX XMLCite \textit{Y. Chen} and \textit{D. Y. Gao}, Springer Proc. Math. Stat. 95, 149--156 (2015; Zbl 1327.90164) Full Text: DOI
Zhang, Lei-Hong; Yang, Wei Hong; Shen, Chungen; Li, Ren-Cang A Krylov subspace method for large-scale second-order cone linear complementarity problem. (English) Zbl 1326.90090 SIAM J. Sci. Comput. 37, No. 4, A2046-A2075 (2015). MSC: 90C33 65K05 65F99 65F15 65F30 65P99 PDFBibTeX XMLCite \textit{L.-H. Zhang} et al., SIAM J. Sci. Comput. 37, No. 4, A2046--A2075 (2015; Zbl 1326.90090) Full Text: DOI Link
Pong, Ting Kei; Wolkowicz, Henry The generalized trust region subproblem. (English) Zbl 1329.90100 Comput. Optim. Appl. 58, No. 2, 273-322 (2014). MSC: 90C20 PDFBibTeX XMLCite \textit{T. K. Pong} and \textit{H. Wolkowicz}, Comput. Optim. Appl. 58, No. 2, 273--322 (2014; Zbl 1329.90100) Full Text: DOI
Pištěk, Miroslav Approximate dynamic programming based on high dimensional model representation. (English) Zbl 1278.90423 Kybernetika 49, No. 5, 720-737 (2013). MSC: 90C39 PDFBibTeX XMLCite \textit{M. Pištěk}, Kybernetika 49, No. 5, 720--737 (2013; Zbl 1278.90423) Full Text: arXiv Link
Martin, David R.; Reichel, Lothar Projected Tikhonov regularization of large-scale discrete ill-posed problems. (English) Zbl 1280.65038 J. Sci. Comput. 56, No. 3, 471-493 (2013). Reviewer: Michael Jung (Dresden) MSC: 65F22 65F20 PDFBibTeX XMLCite \textit{D. R. Martin} and \textit{L. Reichel}, J. Sci. Comput. 56, No. 3, 471--493 (2013; Zbl 1280.65038) Full Text: DOI
Rojas, Marielba; Fotland, Bjørn H.; Steihaug, Trond Computational and sensitivity aspects of eigenvalue-based methods for the large-scale trust-region subproblem. (English) Zbl 1273.90142 Optim. Methods Softw. 28, No. 3, 564-580 (2013). MSC: 90C20 90C06 90C51 PDFBibTeX XMLCite \textit{M. Rojas} et al., Optim. Methods Softw. 28, No. 3, 564--580 (2013; Zbl 1273.90142) Full Text: DOI Link
Bergmann, Ørjan; Steihaug, Trond Solving trust-region subproblem augmented with linear inequality constraints. (English) Zbl 1270.90070 Optim. Methods Softw. 28, No. 1, 26-36 (2013). MSC: 90C30 PDFBibTeX XMLCite \textit{Ø. Bergmann} and \textit{T. Steihaug}, Optim. Methods Softw. 28, No. 1, 26--36 (2013; Zbl 1270.90070) Full Text: DOI
Martin, David R.; Reichel, Lothar Minimization of functionals on the solution of a large-scale discrete ill-posed problem. (English) Zbl 1262.65053 BIT 53, No. 1, 153-173 (2013). MSC: 65F22 65K05 90C05 90C06 PDFBibTeX XMLCite \textit{D. R. Martin} and \textit{L. Reichel}, BIT 53, No. 1, 153--173 (2013; Zbl 1262.65053) Full Text: DOI
Landi, G.; Loli Piccolomini, E. A feasible direction method for image restoration. (English) Zbl 1261.90055 Optim. Lett. 6, No. 8, 1795-1817 (2012). MSC: 90C30 90C90 PDFBibTeX XMLCite \textit{G. Landi} and \textit{E. Loli Piccolomini}, Optim. Lett. 6, No. 8, 1795--1817 (2012; Zbl 1261.90055) Full Text: DOI
Le Thi, Hoai An; Pham Dinh, Tao; Yen, Nguyen Dong Behavior of DCA sequences for solving the trust-region subproblem. (English) Zbl 1259.65092 J. Glob. Optim. 53, No. 2, 317-329 (2012). Reviewer: Hans Benker (Merseburg) MSC: 65K05 90C30 90C35 90C51 PDFBibTeX XMLCite \textit{H. A. Le Thi} et al., J. Glob. Optim. 53, No. 2, 317--329 (2012; Zbl 1259.65092) Full Text: DOI
Benner, Peter; Embree, Mark; Lehoucq, Richard B.; Kelley, C. T. A mathematical biography of Danny C. Sorensen. (English) Zbl 1238.01104 Linear Algebra Appl. 436, No. 8, 2717-2724 (2012). MSC: 01A70 PDFBibTeX XMLCite \textit{P. Benner} et al., Linear Algebra Appl. 436, No. 8, 2717--2724 (2012; Zbl 1238.01104) Full Text: DOI
Apostolopoulou, M. S.; Sotiropoulos, D. G.; Botsaris, C. A.; Pintelas, P. A practical method for solving large-scale TRS. (English) Zbl 1220.90077 Optim. Lett. 5, No. 2, 207-227 (2011). MSC: 90C20 90C06 PDFBibTeX XMLCite \textit{M. S. Apostolopoulou} et al., Optim. Lett. 5, No. 2, 207--227 (2011; Zbl 1220.90077) Full Text: DOI
Landi, G.; Loli Piccolomini, E. An iterative Lagrange method for the regularization of discrete ill-posed inverse problems. (English) Zbl 1202.65183 Comput. Math. Appl. 60, No. 6, 1723-1738 (2010). MSC: 65R30 PDFBibTeX XMLCite \textit{G. Landi} and \textit{E. Loli Piccolomini}, Comput. Math. Appl. 60, No. 6, 1723--1738 (2010; Zbl 1202.65183) Full Text: DOI
Yuan, Gonglin; Wei, Zengxin New line search methods for unconstrained optimization. (English) Zbl 1293.65098 J. Korean Stat. Soc. 38, No. 1, 29-39 (2009). MSC: 65K10 90C26 PDFBibTeX XMLCite \textit{G. Yuan} and \textit{Z. Wei}, J. Korean Stat. Soc. 38, No. 1, 29--39 (2009; Zbl 1293.65098) Full Text: DOI
Yuan, Gonglin; Lu, Xiwen; Wei, Zengxin BFGS trust-region method for symmetric nonlinear equations. (English) Zbl 1168.65026 J. Comput. Appl. Math. 230, No. 1, 44-58 (2009). Reviewer: Costică Moroşanu (Iaşi) MSC: 65H10 65K05 90C26 90C51 PDFBibTeX XMLCite \textit{G. Yuan} et al., J. Comput. Appl. Math. 230, No. 1, 44--58 (2009; Zbl 1168.65026) Full Text: DOI
Grodzevich, Oleg; Wolkowicz, Henry Regularization using a parameterized trust region subproblem. (English) Zbl 1165.90023 Math. Program. 116, No. 1-2 (B), 193-220 (2009). MSC: 90C30 PDFBibTeX XMLCite \textit{O. Grodzevich} and \textit{H. Wolkowicz}, Math. Program. 116, No. 1--2 (B), 193--220 (2009; Zbl 1165.90023) Full Text: DOI
Kosinov, Serhiy; Pun, Thierry Distance-based discriminant analysis method and its applications. (English) Zbl 1422.68213 PAA, Pattern Anal. Appl. 11, No. 3-4, 227-246 (2008). MSC: 68T10 68T05 PDFBibTeX XMLCite \textit{S. Kosinov} and \textit{T. Pun}, PAA, Pattern Anal. Appl. 11, No. 3--4, 227--246 (2008; Zbl 1422.68213) Full Text: DOI Link
Lukšan, L.; Matonoha, C.; Vlček, J. Trust-region interior-point method for large sparse \(l_{1}\) optimization. (English) Zbl 1193.90197 Optim. Methods Softw. 22, No. 5, 737-753 (2007). MSC: 90C30 90C51 90C06 49M37 65K05 PDFBibTeX XMLCite \textit{L. Lukšan} et al., Optim. Methods Softw. 22, No. 5, 737--753 (2007; Zbl 1193.90197) Full Text: DOI
Kearsley, Anthony J. Matrix-free algorithm for the large-scale constrained trust-region subproblem. (English) Zbl 1095.90086 Optim. Methods Softw. 21, No. 2, 233-245 (2006). MSC: 90C20 65K10 PDFBibTeX XMLCite \textit{A. J. Kearsley}, Optim. Methods Softw. 21, No. 2, 233--245 (2006; Zbl 1095.90086) Full Text: DOI
Eldén, L.; Hansen, P. C.; Rojas, M. Minimization of linear functionals defined on solutions of large-scale discrete ill-posed problems. (English) Zbl 1084.65035 BIT 45, No. 2, 329-340 (2005). Reviewer: R. P. Tewarson (Stony Brook) MSC: 65F22 65F20 PDFBibTeX XMLCite \textit{L. Eldén} et al., BIT 45, No. 2, 329--340 (2005; Zbl 1084.65035) Full Text: DOI
Marina, Andretta; Birgin, Ernesto G.; Martínez, José Mario Practical active-set Euclidian trust-region method with spectral projected gradients for bound-constrained minimization. (English) Zbl 1079.65070 Optimization 54, No. 3, 305-325 (2005). Reviewer: Hans Benker (Merseburg) MSC: 65K05 90C30 PDFBibTeX XMLCite \textit{A. Marina} et al., Optimization 54, No. 3, 305--325 (2005; Zbl 1079.65070) Full Text: DOI
Le Thi Hoai An; Pham Dinh Tao; Dinh Nho Hào On the ill-posedness of the trust region subproblem. (English) Zbl 1049.90091 J. Inverse Ill-Posed Probl. 11, No. 6, 545-577 (2003). Reviewer: Mikhail Yu. Kokurin (Yoshkar-Ola) MSC: 90C30 49K40 65J20 90C55 PDFBibTeX XMLCite \textit{Le Thi Hoai An} et al., J. Inverse Ill-Posed Probl. 11, No. 6, 545--577 (2003; Zbl 1049.90091) Full Text: DOI
Sadjadi, Seyed Jafar; Ponnambalam, K. Advances in trust region algorithms for constrained optimization. (English) Zbl 0956.90048 Appl. Numer. Math. 29, No. 3, 423-443 (1999). MSC: 90C30 49M37 49M30 PDFBibTeX XMLCite \textit{S. J. Sadjadi} and \textit{K. Ponnambalam}, Appl. Numer. Math. 29, No. 3, 423--443 (1999; Zbl 0956.90048) Full Text: DOI