TY - JOUR AU - Costa, David G. AU - Guo, Yuxia AU - Ramos, Miguel TI - Existence and multiplicity results for nonlinear elliptic problems in $\bbfR^N$ with an indefinite functional JO - Electronic Journal of Differential Equations PY - 2002 VL - 2002 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/EJDE_2002__2002__a149/ LA - en ID - EJDE_2002__2002__a149 ER -