%0 Journal Article %A G. Dal Maso %A Anneliese Defranceschi %T A characterization of C1-convex sets in Sobolev spaces. %J Manuscripta mathematica %D 1992 %P 247-272 %V 75 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MM2_1992__75_4_155722/ %F MM2_1992__75_4_155722