Geodesic
Bounds for eigenvalues of singular differential operators
Matematičeskie zametki, Tome 20 (1976) no. 6, pp. 859-867.

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The spectrum of the Sturm-Liouville operator is studied, and the principal results consist of two-sided bounds of the eigenvalue distribution and of a criterion establishing that the resolvent belongs to a symmetrically normed ideal sgrtheta. 
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     author = {M. Otelbaev},
     title = {Bounds for eigenvalues of singular differential operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {859--867},
     publisher = {mathdoc},
     volume = {20},
     number = {6},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1976_20_6_a7/}
}
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M. Otelbaev. Bounds for eigenvalues of singular differential operators. Matematičeskie zametki, Tome 20 (1976) no. 6, pp. 859-867. http://geodesic.mathdoc.fr/item/MZM_1976_20_6_a7/