%0 Journal Article
%A A. L. Skubachevskii
%A G. M. Steblov
%T On the spectrum of differential operators with a domain that is
%J Doklady Akademii Nauk
%D 1991
%P 1158-1163
%V 321
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1991_321_6_a7/
%G ru
%F DAN_1991_321_6_a7