%0 Journal Article %A Neil S. Trudinger %T A Sharp Inequality for Subharmonic Functions on Two-Dimensional Manifolds. %J Mathematische Zeitschrift %D 1973 %P 75-80 %V 133 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1973__133_171942/ %F MZ_1973__133_171942