%0 Journal Article %A G. A. Leonov %T A certain hypothesis in the theory of the stability of nonlinear systems %J Differencialʹnye uravneniâ %D 1969 %P 753-756 %V 5 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1969_5_4_a15/ %G ru %F DE_1969_5_4_a15