%0 Journal Article %A Manfredo do Carmo %A Joao Lucas Barbosa %T A Proof of a General Isoperimetric Inequality for Surfaces. %J Mathematische Zeitschrift %D 1978 %P 245-262 %V 162 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1978__162_172732/ %F MZ_1978__162_172732