%0 Journal Article
%A I. M. Vul'pe
%T Generalization of the averaging method of N.\,N.~Bogolyubov to certain classes of differential equations without mean values
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1973
%P 28-32
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1973_12_a3/
%G ru
%F IVM_1973_12_a3