Geodesic
Conditions for the semiboundedness and discreteness of the spectrum of the Sturm--Liouville operator on the semi-axis
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 9 (1967), pp. 31-40.

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@article{IVM_1967_9_a3,
     author = {L. B. Zelenko},
     title = {Conditions for the semiboundedness and discreteness of the spectrum of the {Sturm--Liouville} operator on the semi-axis},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {31--40},
     publisher = {mathdoc},
     number = {9},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1967_9_a3/}
}
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L. B. Zelenko. Conditions for the semiboundedness and discreteness of the spectrum of the Sturm--Liouville operator on the semi-axis. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 9 (1967), pp. 31-40. http://geodesic.mathdoc.fr/item/IVM_1967_9_a3/