%0 Journal Article
%A V. A. Pliss
%T On the existence of a family of periodic solutions for a system of differential equations in case of zero roots
%J Differencialʹnye uravneniâ
%D 1965
%P 17-24
%V 1
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1965_1_1_a2/
%G ru
%F DE_1965_1_1_a2