%0 Journal Article %A A. V. Dmitruk %T Quadratic conditions for a weak minimum for singular regimes in optimal control problems %J Doklady Akademii Nauk %D 1977 %P 523-526 %V 233 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1977_233_4_a3/ %G ru %F DAN_1977_233_4_a3