%0 Journal Article
%A M. Otelbaev
%T Letter to the editors: ``A criterion for discreteness of the spectrum for a degenerate operator, and certain imbedding theorems'' (Differencial'nye Uravnenija \textbf{13} (1977), no.~1, 111--120)
%J Differencialʹnye uravneniâ
%D 1977
%P 2288
%V 13
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1977_13_12_a21/
%G ru
%F DE_1977_13_12_a21