%0 Journal Article
%A A. A. Martynyuk
%T A generalization of the second theorem of N.\,N.~Bogolyubov's averaging principle
%J Doklady Akademii Nauk
%D 1979
%P 46-48
%V 249
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1979_249_1_a9/
%G ru
%F DAN_1979_249_1_a9