W. W. Hager, Second-order sufficient optimality conditions in the calculus of variations, Journal of Optimization Theory and Applications, https://doi.org/10.1007/s10957-025-02639-y.
W. W. Hager, Inequalities and approximation, in Constructive Approaches to Mathematical Models, C. V. Coffman and G. J. Fix, editors, Academic Press, New York, 1979, 189-202.
C. P. Bras, W. W. Hager, and J. J. Judice, An investigation of feasible descent algorithms for estimating the condition number of a matrix, TOP, Journal of the Spanish Society of Statistics and Operations Research, DOI 10.1007/s11750-010-0161-9
J. Luo, W. W. Hager, and R. Wu, A differential equation model for functional mapping of a virus-cell dynamic system, Journal of Mathematical Biology, 61 (2010), pp. 1-15.
W. W. Hager and D. T. Phan, An ellipsoidal branch and bound algorithm for global optimization, SIAM Journal on Optimization, 20 (2009), pp. 740-758.
W. W. Hager, R. Rostamian, D. Wang, The wave annihilation technique and the design of nonreflective coatings, SIAM Journal on Applied Mathematics, 60 (2000), pp. 1388-1424.
N. Ghosh, W. W. Hager, and P. Sarmah, The application of eigenpair stability to block diagonalization (SIAM Journal on Numerical Analysis, 34 (1997), pp. 1255-1268)
Optpack, Software for solving nonlinear optimization problems
Optpack Test problems, Examples showing how to use optpack with the Colville test problems
Holly Peters Hirst, N-step quadratic convergence in the conjugate gradient method (Phd thesis at Penn State University, 1989)
