%0 Journal Article %A Hoang Van Tao %T On the generalization of a certain theorem of N. N. Bogoljubov on averaging %J Differencialʹnye uravneniâ %D 1970 %P 555-557 %V 6 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1970_6_3_a18/ %G ru %F DE_1970_6_3_a18