%0 Journal Article
%A A. E. Gel'man
%T A method of finding periodic solutions of autonomous systems of differential equations
%J Differencialʹnye uravneniâ
%D 1977
%P 949-950
%V 13
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1977_13_5_a18/
%G ru
%F DE_1977_13_5_a18