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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 30, No. 2, pp. 228–231, March–April, 1978.
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Kochubei, A.N. The structure of the spectrum of a non-self-adjoint differential operator. Ukr Math J 30, 174–177 (1978). https://doi.org/10.1007/BF01085639
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DOI: https://doi.org/10.1007/BF01085639