%0 Journal Article %A S. A. Vakhrameev %T An existence theorem for a nonlinear time-optimality problem %J Differencialʹnye uravneniâ %D 1999 %P 565-567 %V 35 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1999_35_4_a15/ %G ru %F DE_1999_35_4_a15