%0 Journal Article
%A V. D. Budaev
%T A necessary condition for the Riesz basis property of systems of root functions of an ordinary nonselfadjoint differential operator
%J Differencialʹnye uravneniâ
%D 1993
%P 20-29
%V 29
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1993_29_1_a3/
%G ru
%F DE_1993_29_1_a3