%0 Journal Article
%A V. M. Bruk
%T Some problems of the spectral theory of a~second-order differential equation with a~variable unbounded operator coefficient
%J Matematičeskie zametki
%D 1974
%P 813-822
%V 16
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1974_16_5_a15/
%G ru
%F MZM_1974_16_5_a15