%0 Journal Article
%A V. A. Pliss
%T Families of periodic solutions of systems of differential equations of second order without dissipation
%J Differencialʹnye uravneniâ
%D 1965
%P 1428-1448
%V 1
%N 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1965_1_11_a1/
%G ru
%F DE_1965_1_11_a1