%0 Journal Article
%A S. N. Shimanov
%A N. I. Kazeeva
%T A fundamental theorem on critical cases of difference systems
%J Differencialʹnye uravneniâ
%D 1971
%P 910-918
%V 7
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1971_7_5_a12/
%G ru
%F DE_1971_7_5_a12