%0 Journal Article %A A. N. Filatov %T On averaging in systems of integro-differential equations %J Differencialʹnye uravneniâ %D 1967 %P 1725-1731 %V 3 %N 10 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1967_3_10_a9/ %G ru %F DE_1967_3_10_a9