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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 24, No. 6, pp. 846–851, November–December, 1972.
The author is deeply grateful to Yu. M. Berezanskii for formulating the problem and for his attention to the research.
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Tyutyunnik, L.I. On a self-adjoint operator associated with elliptic problems with a spectral parameter in the boundary conditions. Ukr Math J 24, 682–686 (1972). https://doi.org/10.1007/BF01085424
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DOI: https://doi.org/10.1007/BF01085424