%0 Journal Article %A Zaidman, S. %T A Convexity Result for Weak Differential Inequalities %J Canadian mathematical bulletin %D 1976 %P 235-244 %V 19 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1976-037-4/ %R 10.4153/CMB-1976-037-4 %F 10_4153_CMB_1976_037_4