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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 25, No. 3, pp. 373–379, May–June, 1973.
In conclusion the author wishes to express his sincere gratitude to Yu. M. Berezanskii and Ya. A. Roitberg for their direction of the work.
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Kovalenko, I.A. Theorems on isomorphisms for elliptic systems with boundary conditions which are not normal. Ukr Math J 25, 303–307 (1973). https://doi.org/10.1007/BF01091882
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DOI: https://doi.org/10.1007/BF01091882