%0 Journal Article %A V. I. Gurman %A G. Konstantinov %T Description and estimate of sets of attainability of controllable systems %J Differencialʹnye uravneniâ %D 1987 %P 416-423 %V 23 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1987_23_3_a5/ %G ru %F DE_1987_23_3_a5