%0 Journal Article
%A È. I. Grudo
%T A differential system with a zero root of the characteristic equation and with periodic coefficients
%J Differencialʹnye uravneniâ
%D 1978
%P 974-993
%V 14
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1978_14_6_a1/
%G ru
%F DE_1978_14_6_a1