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@article{MZM_1993_54_6_a9, author = {R. M. Trigub}, title = {Direct theorems on approximation of smooth functions by algebraic polynomials on a segment}, journal = {Matemati\v{c}eskie zametki}, pages = {113--121}, publisher = {mathdoc}, volume = {54}, number = {6}, year = {1993}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1993_54_6_a9/} }
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/