%0 Journal Article
%A A. I. Zeifman
%T Positivity of the Cauchy matrix of a linear periodic system
%J Differencialʹnye uravneniâ
%D 1989
%P 1618-1619
%V 25
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1989_25_9_a22/
%G ru
%F DE_1989_25_9_a22