%0 Journal Article %A B. F. Bylov %T Transformation of time in problems of stability with respect to the first approximation %J Differencialʹnye uravneniâ %D 1965 %P 1149-1154 %V 1 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1965_1_9_a2/ %G ru %F DE_1965_1_9_a2