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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 25, No. 2, pp. 277–283, March–April, 1973.
In conclusion the authors express deep appreciation to Yu. M. Berezanskii for discussion of the results.
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Kostarchuk, Y.V., Roitberg, Y.A. Theorems on isomorphisms for elliptic boundary value problems with boundary conditions which are not normal. Ukr Math J 25, 222–226 (1973). https://doi.org/10.1007/BF01096983
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DOI: https://doi.org/10.1007/BF01096983