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Additional information
Moscow State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 5, No. 1, pp. 71–72, January–March, 1971.
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Grushin, V.V. On the proof of the discreteness of the spectrum of one class of differential operators in Rn . Funct Anal Its Appl 5, 58–59 (1971). https://doi.org/10.1007/BF01075849
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DOI: https://doi.org/10.1007/BF01075849