%0 Journal Article %A A. V. Dmitruk %T Quadratic conditions for a Pontryagin minimum in an optimal control problem linear in the control. II. Theorems on weakening equality constraints %J Izvestiya. Mathematics %D 1988 %P 121-141 %V 31 %N 1 %U http://geodesic.mathdoc.fr/item/IM2_1988_31_1_a4/ %G en %F IM2_1988_31_1_a4