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Translated from Matematicheskie Zametki, Vol. 38, No. 1, pp. 80–88, July, 1985.
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Ponomarev, S.P. Symmetrically differentiable functions with a perfect set of nondifferentiability points. Mathematical Notes of the Academy of Sciences of the USSR 38, 557–562 (1985). https://doi.org/10.1007/BF01137468
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DOI: https://doi.org/10.1007/BF01137468