%0 Journal Article
%A E. P. Volokitin
%A S. A. Treskov
%T On periodic solutions of a system of differential equations
%J Differencialʹnye uravneniâ
%D 1999
%P 291-295
%V 35
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1999_35_3_a0/
%G ru
%F DE_1999_35_3_a0