%0 Journal Article
%A È. I. Grudo
%T Periodic solutions of periodic differential systems in the general critical case
%J Differencialʹnye uravneniâ
%D 1982
%P 763-767
%V 18
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1982_18_5_a4/
%G ru
%F DE_1982_18_5_a4