%0 Journal Article %A A.J. Tromba %T A Sufflcient Condition for a Critical Point of a Functional to be a Minimum and Its Application to Plateau' s Problem. %J Mathematische Annalen %D 1983 %P 303-312 %V 263 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAN_1983__263_163749/ %F MAN_1983__263_163749