%0 Journal Article
%A S. I. Pokhozhaev
%T Periodic solutions of some nonlinear systems of ordinary differential equations
%J Differencialʹnye uravneniâ
%D 1980
%P 109-116
%V 16
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1980_16_1_a12/
%G ru
%F DE_1980_16_1_a12