%0 Journal Article
%A N. N. Vinogradov
%T Some existence theorems for a periodic solution of an autonomous system of six differential equations
%J Differencialʹnye uravneniâ
%D 1965
%P 330-334
%V 1
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1965_1_3_a6/
%G ru
%F DE_1965_1_3_a6