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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 34, No. 5, pp. 641–644, September–October, 1982.
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Roitberg, Y.A., Serdyuk, V.A. A theorem on the complete set of isomorphisms for genepal elliptic problems with a parameter. Ukr Math J 34, 523–526 (1982). https://doi.org/10.1007/BF01093146
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DOI: https://doi.org/10.1007/BF01093146