%0 Journal Article
%A È. I. Grudo
%T Periodic solutions with incommensurable periods of periodic differential systems
%J Differencialʹnye uravneniâ
%D 1986
%P 1499-1504
%V 22
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1986_22_9_a2/
%G ru
%F DE_1986_22_9_a2