%0 Journal Article %A V. A. Yakubovich %T Some variants of the abstract maximum principle %J Doklady Akademii Nauk %D 1976 %P 816-819 %V 229 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1976_229_4_a9/ %G ru %F DAN_1976_229_4_a9