@article{article4b1419de,
title   = {Spectral projected gradient and variable metric methods for optimization with linear inequalities},
author = {Andreani, Roberto and Birgin, Ernesto Julian Goldberg and Martínez, José Mário and Yuan, JinYun},
year = {2005},
doi = {10.1093/imanum/drh020},
journal   = {IMA Journal of Numerical Analysis}
}