%0 Journal Article
%A O. D. Apyshev
%A M. Otelbaev
%T On the spectrum of a~class of differential operators and some imbedding theorems
%J Izvestiya. Mathematics 
%D 1980
%P 1-24
%V 15
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_1980_15_1_a0/
%G en
%F IM2_1980_15_1_a0