%0 Journal Article
%A I. A. Pasynkova
%T The existence of a family of periodic solutions of a system of two second order differential equations
%J Differencialʹnye uravneniâ
%D 1969
%P 814-823
%V 5
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1969_5_5_a2/
%G ru
%F DE_1969_5_5_a2