%0 Journal Article %A M. V. Druzhinina %A A. L. Fradkov %T Velocity gradient and velocity difference algorithms in a nonlinear control problem: stepwise synthesis %J Differencialʹnye uravneniâ %D 1994 %P 1861-1868 %V 30 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1994_30_11_a2/ %G ru %F DE_1994_30_11_a2