%0 Journal Article
%A F. G. Maslova
%T A problem in the spectral theory of differential operators
%J Doklady Akademii Nauk
%D 1963
%P 820
%V 152
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1963_152_4_a12/
%G ru
%F DAN_1963_152_4_a12