@inbook{inbook4d031dc3,
title   = {A box-constrained optimization algorithm with negative curvature directions and spectral projected gradients},
author = {Birgin, Ernesto Julian Goldberg and Martínez, José Mário},
year = {2001},
doi = {10.1007/978-3-7091-6217-0_5},
publisher = {Springer},
journal   = {Topics in numerical analysis : with special emphasis on nonlinear problems}
}