%0 Journal Article
%A N. B. Uskova
%T On the spectrum of some classes of differential operators
%J Differencialʹnye uravneniâ
%D 1994
%P 350-352
%V 30
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1994_30_2_a22/
%G ru
%F DE_1994_30_2_a22