%0 Journal Article
%A È. I. Grudo
%T A differential system with two purely imaginary roots of a characteristic equation
%J Differencialʹnye uravneniâ
%D 1980
%P 963-979
%V 16
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1980_16_6_a0/
%G ru
%F DE_1980_16_6_a0