%0 Journal Article %A Cellina, A. %A Colombo, G. %T On a classical problem of the calculus of variations without convexity assumptions %J Annales de l'I.H.P. Analyse non linéaire %D 1990 %P 97-106 %V 7 %N 2 %I Gauthier-Villars %U http://www.numdam.org/item/AIHPC_1990__7_2_97_0/ %G en %F AIHPC_1990__7_2_97_0