%0 Journal Article
%A O. V. Belyantsev
%T The Bessel inequality and the basis property of root functions of a second-order singular differential operator
%J Differencialʹnye uravneniâ
%D 2000
%P 1011-1020
%V 36
%N 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_2000_36_8_a0/
%G ru
%F DE_2000_36_8_a0