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Translated from Matematicheskie Zametki, Vol. 44, No. 5, pp. 645–659, November, 1988.
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Isakov, N.M. Cγ-Property and approximately differentiable functions. Mathematical Notes of the Academy of Sciences of the USSR 44, 833–842 (1988). https://doi.org/10.1007/BF01158424
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DOI: https://doi.org/10.1007/BF01158424