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Translated from Matematicheskie Zametki, Vol. 30, No. 2, pp. 187–196, August, 1981.
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Aliev, I.V., Yakubov, S.Y. Second-order differential-operator equations with discrete spectrum on the whole axis. Mathematical Notes of the Academy of Sciences of the USSR 30, 580–585 (1981). https://doi.org/10.1007/BF01708836
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DOI: https://doi.org/10.1007/BF01708836