%0 Journal Article %A Clark, Marcondes R. %A Lima, Osmundo A. %T Existence of solutions for a variational unilateral system %J Electronic journal of differential equations %D 2002 %V 2002 %U http://geodesic.mathdoc.fr/item/EJDE_2002__2002__a69/ %G en %F EJDE_2002__2002__a69