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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 34, No. 3, pp. 350–356, May–June, 1982.
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Derfel', G.A. Behavior of solutions of functional and differential-functional equations with several transformations of the independent variable. Ukr Math J 34, 286–291 (1982). https://doi.org/10.1007/BF01682121
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DOI: https://doi.org/10.1007/BF01682121