%0 Journal Article
%A Tyagi,  Jagmohan
%T Existence of non-negative solutions for predator-prey elliptic systems with a sign-changing nonlinearity
%J Electronic journal of differential equations
%D 2011
%V 2011
%U http://geodesic.mathdoc.fr/item/EJDE_2011__2011__a99/
%G en
%F EJDE_2011__2011__a99