%0 Journal Article %A V. N. Ushakov %A A. R. Matviichuk %A A. V. Ushakov %A G. V. Parshikov %T The invariance of sets in the construction of solutions to a problem of approach at a fixed time %J Trudy Instituta matematiki i mehaniki %D 2013 %P 264-283 %V 19 %N 1 %U http://geodesic.mathdoc.fr/item/TIMM_2013_19_1_a26/ %G ru %F TIMM_2013_19_1_a26