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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 26, No. 6, pp. 836–841, November–December, 1974.
The authors wish to take this opportunity to express their gratutude to Yu. L. Daletskii for his helpful discussions and assistance.
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Syavavko, M.S., Mel'nichak, P.P. A class of equations with functional derivatives. Ukr Math J 26, 690–694 (1974). https://doi.org/10.1007/BF01085268
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DOI: https://doi.org/10.1007/BF01085268