@article{EJDE_2005__2005__a204,
     author = {Serag, Hassan M. and El-Zahrani, Eada A.},
     title = {Maximum principle and existence of positive solutions for nonlinear systems on $\Bbb R^N$},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2005},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2005__2005__a204/}
}