%0 Journal Article %A D. B. Silin %T On the variation and Riemann integrability of an optimal control in linear systems %J Doklady Akademii Nauk %D 1981 %P 548-550 %V 257 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1981_257_3_a6/ %G ru %F DAN_1981_257_3_a6