%0 Journal Article
%A P. G. Aizengendler
%A M. M. Vainberg
%T On periodic solutions of non-autonomous systems
%J Doklady Akademii Nauk
%D 1965
%P 255-257
%V 165
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1965_165_2_a0/
%G ru
%F DAN_1965_165_2_a0