@article{EJDE_2008__2008__a44,
     author = {Dram\'e,  Abdou K. and Costa,  David G.},
     title = {Existence of positive solutions for semi-positone systems},
     journal = {Electronic journal of differential equations},
     year = {2008},
     volume = {2008},
     zbl = {1143.34011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2008__2008__a44/}
}