TY  - JOUR
AU  - V. P. Belogrud'
AU  - A. G. Kostyuchenko
TI  - The density of the spectrum of a Sturm–Liouville operator
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1973
VL  - 28
IS  - 2
UR  - http://geodesic.mathdoc.fr/item/RM_1973_28_2_a12/
LA  - ru
ID  - RM_1973_28_2_a12
ER  -