%0 Journal Article
%A I. A. Pasynkova
%T The existence of families of periodic solutions of a system of $n$ second order differential equations in the resonance case
%J Differencialʹnye uravneniâ
%D 1969
%P 1984-1989
%V 5
%N 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1969_5_11_a3/
%G ru
%F DE_1969_5_11_a3