%0 Journal Article
%A V. A. Il'in
%T Necessary and sufficient conditions for being a Riesz basis of root vectors of second-order discontinuous operators
%J Differencialʹnye uravneniâ
%D 1986
%P 2059-2071
%V 22
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1986_22_12_a5/
%G ru
%F DE_1986_22_12_a5