%0 Journal Article
%A Yu. A. Konyaev
%T On the existence of periodic solutions of some systems of differential equations with a small parameter at the derivative
%J Doklady Akademii Nauk
%D 1982
%P 40-44
%V 264
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1982_264_1_a8/
%G ru
%F DAN_1982_264_1_a8