%0 Journal Article %A M. I. Gusev %T On external estimates for reachable sets of nonlinear control systems %J Trudy Instituta matematiki i mehaniki %D 2011 %P 60-69 %V 17 %N 1 %U http://geodesic.mathdoc.fr/item/TIMM_2011_17_1_a5/ %G ru %F TIMM_2011_17_1_a5