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Translated from Matematicheskie Zametki, Vol. 53, No. 6, pp. 11–21, June, 1993.
The author expresses his gratitude to Professor B. I. Golubov for stating the problem and for his valuable advice.
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Volosivets, S.S. Approximation of functions of bounded p-variation by means of polynomials of the Haar and Walsh systems. Math Notes 53, 569–575 (1993). https://doi.org/10.1007/BF01212591
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DOI: https://doi.org/10.1007/BF01212591