William W. Hager and Hongchao Zhang, Algorithm 1035: A Gradient-Based Implementation of the Polyhedral Active Set Algorithm, ACM Transactions on Mathematical Software, 49 (2023), No. 2, Article 20, 1-13, https://doi.org/10.1145/3583559
William W. Hager and Hongchao Zhang, An Active Set Algorithm for Nonlinear Optimization with Polyhedral Constraints, Science China Mathematics, ICIAM Special Issue, 59 (2016), pp. 1525-1542, doi: 10.1007/s11425-016-0300-6
William W. Hager and Hongchao Zhang, Projection onto a Polyhedron that Exploits Sparsity, SIAM Journal on Optimization, 29 (2016), 1773-1798, doi:10.1137/15M102825X
William W. Hager and Hongchao Zhang, An Affine Scaling Method for Optimization Problems with Polyhedral Constraints, Computational Optimization and Application, 59 (2014), pp. 163-183, DOI 10.1007/s10589-013-9535-x
W. W. Hager, B. A. Mair, and H. Zhang, An Affine-scaling Interior-point CBB Method for Box-Constrained Optimization, Mathematical Programming, 119 (2009), pp. 1-32.
W. W. Hager and H. Zhang, A new conjugate gradient method with guaranteed descent and an efficient line search, SIAM Journal on Optimization, 16 (2005), 170-192.
W. W. Hager and H. Zhang, Algorithm 851: CG_DESCENT, A conjugate gradient method with guaranteed descent, ACM Transactions on Mathematical Software, 32 (2006), 113-137.
W. W. Hager and H. Zhang, Recent advances in bound constrained optimization, in System Modeling and Optimization, F. Ceragioli, A. Dontchev, H. Furuta, K. Marti, and L. Pandolfi, eds., Springer, 2006, pp. 67-82. (22nd IFIP TC 7 Conference on System Modeling and Optimization, Turin, Italy, July 18-22, 2005).
H. Zhang and W. W. Hager, A nonmonotone line search technique and its application to unconstrained optimization, SIAM Journal on Optimization, 14 (2004), pp. 1043-1056.
W. W. Hager and S. C. Park, The gradient projection method with exact line search, Journal of Global Optimization, 30 (2004), pp. 103-118.
W. W. Hager, Analysis and implementation of a dual algorithm for constrained optimization, Journal of Optimization Theory and Applications, 79 (1993), pp. 427-462.
W. W. Hager, A derivative-based bracketing scheme for univariate minimization and the conjugate gradient method, Computers Math. Applic., 18 (1989), pp. 779-795.
N. Ghosh and W. W. Hager, A derivative-free bracketing scheme for univariate minimization, Computers Math. Applic., 20 (1990), pp. 23-34.
Holly Peters Hirst, N-step quadratic convergence in the conjugate gradient method (Phd thesis at Penn State University, 1989)
W. W. Hager, Dual techniques for constrained optimization, Journal of Optimization Theory and Applications, 55 (1987), pp. 37-71.