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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 33, No. 2, pp. 227–233, March–April, 1981.
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Cheremnykh, E.V. Spectral analysis of some non-self-adjoint operators. Ukr Math J 33, 177–181 (1981). https://doi.org/10.1007/BF01086077
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DOI: https://doi.org/10.1007/BF01086077