Geodesic
Self-adjoint boundary problems with discrete spectrum generated by the Sturm–Liouville equation with unbounded operator coefficient
Funkcionalʹnyj analiz i ego priloženiâ, Tome 5 (1971) no. 4, pp. 67-68 
V. I. Gorbachuk; M. L. Gorbachuk. Self-adjoint boundary problems with discrete spectrum generated by the Sturm–Liouville equation with unbounded operator coefficient. Funkcionalʹnyj analiz i ego priloženiâ, Tome 5 (1971) no. 4, pp. 67-68. http://geodesic.mathdoc.fr/item/FAA_1971_5_4_a9/
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     title = {Self-adjoint boundary problems with discrete spectrum generated by the {Sturm{\textendash}Liouville} equation with unbounded operator coefficient},
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] Gorbachuk M.L., Funkts. analiz, 5:1 (1971), 10–21 | MR | Zbl

[2] Gokhberg I.Ts., Krein M.G., Vvedenie v teoriyu lineinykh nesamosopryazhennykh operatorov, Nauka, M., 1965

[3] Rofe-Beketov F.S., Teoriya funktsii, funkts. analiz i ego prilozheniya, 8, Kharkov, 1969, 3–24 | MR | Zbl