%0 Journal Article
%A V. D. Budaev
%T Criteria for the Bessel property and the Riesz basis property of systems of root functions of differential operators. I
%J Differencialʹnye uravneniâ
%D 1991
%P 2033-2044
%V 27
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1991_27_12_a1/
%G ru
%F DE_1991_27_12_a1