%0 Journal Article %A Roubíček, Tomáš %T Optimality conditions for nonconvex variational problems relaxed in terms of Young measures %J Kybernetika %D 1998 %P 335-347 %V 34 %N 3 %U http://geodesic.mathdoc.fr/item/KYB_1998_34_3_a5/ %G en %F KYB_1998_34_3_a5