Letter to the editors: ``A criterion for discreteness of the spectrum for a degenerate operator, and certain imbedding theorems'' (Differencial'nye Uravnenija \textbf{13} (1977), no.~1, 111--120)
Differencialʹnye uravneniâ, Tome 13 (1977) no. 12.

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     author = {M. Otelbaev},
     title = {Letter to the editors: {``A} criterion for discreteness of the spectrum for a degenerate operator, and certain imbedding theorems'' {(Differencial'nye} {Uravnenija} \textbf{13} (1977), no.~1, 111--120)},
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M. Otelbaev. Letter to the editors: ``A criterion for discreteness of the spectrum for a degenerate operator, and certain imbedding theorems'' (Differencial'nye Uravnenija \textbf{13} (1977), no.~1, 111--120). Differencialʹnye uravneniâ, Tome 13 (1977) no. 12. http://geodesic.mathdoc.fr/item/DE_1977_13_12_a21/