Geodesic
The density of the spectrum of a Sturm–Liouville operator
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 28 (1973) no. 2 
V. P. Belogrud'; A. G. Kostyuchenko. The density of the spectrum of a Sturm–Liouville operator. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 28 (1973) no. 2. http://geodesic.mathdoc.fr/item/RM_1973_28_2_a12/
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     title = {The density of the spectrum of a {Sturm{\textendash}Liouville} operator},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1973_28_2_a12/}
}
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[2] B. M. Levitan, I. S. Sargsyan, Vvedenie v spektralnuyu teoriyu, «Nauka», M., 1970 | MR | Zbl

[3] E. I. Koddington, N. Levinson, Teoriya obyknovennykh differentsialnykh uravnenii, IL, M., 1958

[4] T. Selander, “Bilateral Tauberian theorems of Keldyš type”, Ark. Math., 5:6 (1963), 85–96 | DOI | MR | Zbl