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Translated from Matematicheskie Zametki, Vol. 54, No. 6, pp. 113–121, December, 1993.
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Trigub, R.M. Direct theorems on approximation of smooth functions by algebraic polynomials on a segment. Math Notes 54, 1261–1266 (1993). https://doi.org/10.1007/BF01209088
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DOI: https://doi.org/10.1007/BF01209088