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Translated from Matematicheskie Zametki, Vol. 37, No. 2, pp. 249–256, February, 1985.
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Dezin, A.A. Spectral characteristics of general boundary-value problems for operator D2 . Mathematical Notes of the Academy of Sciences of the USSR 37, 142–146 (1985). https://doi.org/10.1007/BF01156759
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DOI: https://doi.org/10.1007/BF01156759