%0 Journal Article
%A V. F. Lisyanoi
%T Classification of formal periodic systems
%J Differencialʹnye uravneniâ
%D 1985
%P 2173-2175
%V 21
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1985_21_12_a22/
%G ru
%F DE_1985_21_12_a22