%0 Journal Article %A U. Raitums %T The maximum principle and the passage to convex hulls in optimal %J Doklady Akademii Nauk %D 1993 %P 553-555 %V 329 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1993_329_5_a6/ %G ru %F DAN_1993_329_5_a6