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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 25, No. 4, pp. 479–491, July–August, 1973.
The authors are profoundly grateful to Yu. M. Berezanskii for discussions of the results.
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Roitberg, Y.A., Sheftel', Z.G. Green's formula and the hypothesis of solvability for nonlocal elliptic boundary problems. Ukr Math J 25, 396–405 (1973). https://doi.org/10.1007/BF01085452
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DOI: https://doi.org/10.1007/BF01085452