500 the Shanno-Phua version of BFGS plus CG 611 trust region BFGS, this is a reliable and fairly efficient code. 630 A combined limited memory qN/cg method (degrades for nonconvex f, nevertheless applicable; for ill-conditioned problem an individual preconditioner must be provided) 702 truncated Newton based on the Lanczos process 739 tensor model quasi-Newton method, may be better for strongly nonquadratic f