%0 Journal Article %A V. V. Laricheva %A M. V. Rein %T Multivalued extremal solutions in optimal control problems %J Doklady Akademii Nauk %D 1968 %P 1309-1311 %V 180 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1968_180_6_a11/ %G ru %F DAN_1968_180_6_a11