%0 Journal Article
%A A. V. Savkin
%T Frequency criteria for the stability and instability of linear periodic systems
%J Differencialʹnye uravneniâ
%D 1989
%P 1332-1339
%V 25
%N 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1989_25_8_a5/
%G ru
%F DE_1989_25_8_a5