@article{02189135,
title = {Maximum principle and existence of positive solutions for nonlinear systems on },
journal = {Electronic Journal of Differential Equations (EJDE) [electronic only]},
volume = {2005},
year = {2005},
zbl = {1140.35366},
language = {en},
url = {http://dml.mathdoc.fr/item/02189135}
}
Serag, Hassan M.; El-Zahrani, Eada A. Maximum principle and existence of positive solutions for nonlinear systems on . Electronic Journal of Differential Equations (EJDE) [electronic only], Tome 2005 (2005) . http://gdmltest.u-ga.fr/item/02189135/