%0 Journal Article
%A O. I. Nikitin
%A A. I. Perov
%T On the question of approximate determination of periodic solutions of differential equations
%J Differencialʹnye uravneniâ
%D 1983
%P 2001-2004
%V 19
%N 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1983_19_11_a27/
%G ru
%F DE_1983_19_11_a27