Geodesic
The spectral property of a perturbed Sturm–Liouville operator with nonlocal boundary conditions
Differencialʹnye uravneniâ, Tome 21 (1985) no. 3, pp. 494-499 
G. M. Kesel'man. The spectral property of a perturbed Sturm–Liouville operator with nonlocal boundary conditions. Differencialʹnye uravneniâ, Tome 21 (1985) no. 3, pp. 494-499. http://geodesic.mathdoc.fr/item/DE_1985_21_3_a15/
@article{DE_1985_21_3_a15,
     author = {G. M. Kesel'man},
     title = {The spectral property of a perturbed {Sturm{\textendash}Liouville} operator with nonlocal boundary conditions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {494--499},
     year = {1985},
     volume = {21},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_3_a15/}
}
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