A criterion for discreteness of the spectrum for a certain degenerate operator, and certain imbedding theorems
Differencialʹnye uravneniâ, Tome 13 (1977) no. 1, pp. 111-120.

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     author = {M. Otelbaev},
     title = {A criterion for discreteness of the spectrum for a certain degenerate operator, and certain imbedding theorems},
     journal = {Differencialʹnye uravneni\^a},
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     year = {1977},
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     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_1_a15/}
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M. Otelbaev. A criterion for discreteness of the spectrum for a certain degenerate operator, and certain imbedding theorems. Differencialʹnye uravneniâ, Tome 13 (1977) no. 1, pp. 111-120. http://geodesic.mathdoc.fr/item/DE_1977_13_1_a15/