Best Hausdorff approximations by algebraic polynomials and continuity of a function
Matematičeskie zametki, Tome 28 (1980) no. 6, pp. 843-858.

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     author = {A. I. Ermakov},
     title = {Best {Hausdorff} approximations by algebraic polynomials and continuity of a function},
     journal = {Matemati\v{c}eskie zametki},
     pages = {843--858},
     publisher = {mathdoc},
     volume = {28},
     number = {6},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1980_28_6_a4/}
}
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A. I. Ermakov. Best Hausdorff approximations by algebraic polynomials and continuity of a function. Matematičeskie zametki, Tome 28 (1980) no. 6, pp. 843-858. http://geodesic.mathdoc.fr/item/MZM_1980_28_6_a4/