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Translated from Matematicheskie Zametki, Vol. 26, No. 1, pp. 77–87, July, 1979.
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Sevast'yanov, E.A. Best piecewise-monotone approximation and the Banach indicatrix. Mathematical Notes of the Academy of Sciences of the USSR 26, 528–535 (1979). https://doi.org/10.1007/BF01140276
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DOI: https://doi.org/10.1007/BF01140276