TY  - JOUR
AU  - Tyagi,  Jagmohan
TI  - Existence of non-negative solutions for predator-prey elliptic systems with a sign-changing nonlinearity
JO  - Electronic journal of differential equations
PY  - 2011
VL  - 2011
UR  - http://geodesic.mathdoc.fr/item/EJDE_2011__2011__a99/
LA  - en
ID  - EJDE_2011__2011__a99
ER  -