Geodesic
A criterion for the discreteness of the spectrum of the general Sturm–Liouville operator, and embedding theorems connected with it
Differencialʹnye uravneniâ, Tome 24 (1988) no. 4, pp. 584-591 
R. Oinarov; M. Otelbaev. A criterion for the discreteness of the spectrum of the general Sturm–Liouville operator, and embedding theorems connected with it. Differencialʹnye uravneniâ, Tome 24 (1988) no. 4, pp. 584-591. http://geodesic.mathdoc.fr/item/DE_1988_24_4_a5/
@article{DE_1988_24_4_a5,
     author = {R. Oinarov and M. Otelbaev},
     title = {A criterion for the discreteness of the spectrum of the general {Sturm{\textendash}Liouville} operator, and embedding theorems connected with it},
     journal = {Differencialʹnye uravneni\^a},
     pages = {584--591},
     year = {1988},
     volume = {24},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1988_24_4_a5/}
}
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