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Translated from Matematicheskie Zametki, Vol. 41, No. 4, pp. 500–508, April, 1987.
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Isakov, N.M. A global property of approximately differentiable functions. Mathematical Notes of the Academy of Sciences of the USSR 41, 280–285 (1987). https://doi.org/10.1007/BF01137673
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DOI: https://doi.org/10.1007/BF01137673