%0 Journal Article %A F. De Blasi %A G. Pianigiani %T On the density of extremal solutions of differential inclusions %J Annales Polonici Mathematici %D 1991 %P 133-142 %V 56 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-56-2-133-142/ %R 10.4064/ap-56-2-133-142 %G en %F 10_4064_ap_56_2_133_142