Geodesic
On the Density of Discrete Spectra of Sturm--Liouville Singular Operators
Matematičeskie zametki, Tome 71 (2002) no. 2, pp. 307-311.

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     title = {On the {Density} of {Discrete} {Spectra} of {Sturm--Liouville} {Singular} {Operators}},
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N. F. Valeev. On the Density of Discrete Spectra of Sturm--Liouville Singular Operators. Matematičeskie zametki, Tome 71 (2002) no. 2, pp. 307-311. http://geodesic.mathdoc.fr/item/MZM_2002_71_2_a13/

[1] Kostyuchenko A. G., Sargsyan I. S., Raspredelenie sobstvennykh znachenii. Samosopryazhennye obyknovennye differentsialnye operatory, Nauka, M., 1979 | Zbl

[2] Valeev N. F., Sultanaev Ya. T., Matem. zametki, 65:6 (1999), 932–938 | MR | Zbl