%0 Journal Article %A A. N. Filatov %T Partial averaging in systems of ordinary differential equations %J Differencialʹnye uravneniâ %D 1970 %P 1118-1120 %V 6 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1970_6_6_a17/ %G ru %F DE_1970_6_6_a17