@article{GDZPPN00117388X,
title = {Optimization under Nonnegativity Constraints.},
journal = {Numerische Mathematik},
volume = {28},
year = {1977},
pages = {287-294},
zbl = {0348.65062},
url = {http://dml.mathdoc.fr/item/GDZPPN00117388X}
}
Mavrides, L.P. Optimization under Nonnegativity Constraints.. Numerische Mathematik, Tome 28 (1977) pp. 287-294. http://gdmltest.u-ga.fr/item/GDZPPN00117388X/