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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 28, No. 4, pp. 532–537, July–August, 1976.
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Kostarchuk, Y.V. Isomorphism theorems and their applications for elliptic boundary-value problems with discontinuous coefficients, and boundary conditions and conjugacy conditions which are not normal. Ukr Math J 28, 412–416 (1976). https://doi.org/10.1007/BF01101663
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DOI: https://doi.org/10.1007/BF01101663