%0 Journal Article %A Wolfgang Walter %T A Theorem on Elliptic Differential Inequalities with an Application to Gradient Bounds. %J Mathematische Zeitschrift %D 1988 %P 293-300 %V 200 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1988__200_3_174009/ %F MZ_1988__200_3_174009