Direct theorems on approximation of smooth functions by algebraic polynomials on a segment
Matematičeskie zametki, Tome 54 (1993) no. 6, pp. 113-121.

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R. M. Trigub. Direct theorems on approximation of smooth functions by algebraic polynomials on a segment. Matematičeskie zametki, Tome 54 (1993) no. 6, pp. 113-121. http://geodesic.mathdoc.fr/item/MZM_1993_54_6_a9/

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