%0 Journal Article
%A V. I. Filippenko
%T Estimation of the multiplicity of the spectrum of a selfadjoint differential operator
%J Differencialʹnye uravneniâ
%D 1975
%P 2286-2287
%V 11
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1975_11_12_a25/
%G ru
%F DE_1975_11_12_a25