%0 Journal Article
%A B. M. Levitan
%A I. S. Sargsyan
%T Some problems in the theory of a~Sturm--Liouville equation
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1960
%P 1-95
%V 15
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1960_15_1_a0/
%G en
%F RM_1960_15_1_a0