%0 Journal Article %A GasiƄski, Leszek %A Papageorgiou, Nikolaos S. %T Extremal solutions and strong relaxation for second order multivalued boundary value problems %J Czechoslovak Mathematical Journal %D 2005 %P 827-844 %V 55 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMJ_2005__55_4_a1/ %G en %F CMJ_2005__55_4_a1