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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 27, No. 3, pp. 373–378, May–June, 1975.
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Koval'chik, I.M. Linear equations with functional derivatives. Ukr Math J 27, 301–304 (1975). https://doi.org/10.1007/BF01092089
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DOI: https://doi.org/10.1007/BF01092089