%0 Journal Article %A S. L. Nosov %T Averaging of a perturbed system over the time interval $O(\varepsilon^{-k})$, $k>1$ %J Differencialʹnye uravneniâ %D 1979 %P 805-808 %V 15 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1979_15_5_a3/ %G ru %F DE_1979_15_5_a3