%0 Journal Article %A Yu. S. Bogdanov %T Asymptotic characteristics of nonlinear differential systems %J Differencialʹnye uravneniâ %D 1965 %P 41-52 %V 1 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1965_1_1_a5/ %G ru %F DE_1965_1_1_a5