%0 Journal Article %A Yu. V. Masterkov %A L. I. Rodina %T Sufficient and Necessary Conditions for the Stable Controllability of a Nonlinear Nonstationary System on the Plane in the Critical Case %J Differencialʹnye uravneniâ %D 2003 %P 227-235 %V 39 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_2003_39_2_a8/ %G ru %F DE_2003_39_2_a8