%0 Journal Article
%A A. A. Boichuk
%A N. A. Perestyuk
%A A. M. Samoilenko
%T Periodic solutions of impulse differential systems in critical cases
%J Differencialʹnye uravneniâ
%D 1991
%P 1516-1521
%V 27
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1991_27_9_a4/
%G ru
%F DE_1991_27_9_a4