Geodesic
Certain direct and inverse theorems in the theory of best approximations of functions by algebraic polynomials
Doklady Akademii Nauk, Tome 187 (1969) no. 4, pp. 719-722.

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     author = {Arif S. Dzhafarov},
     title = {Certain direct and inverse theorems in the theory of best approximations of functions by algebraic polynomials},
     journal = {Doklady Akademii Nauk},
     pages = {719--722},
     publisher = {mathdoc},
     volume = {187},
     number = {4},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_187_4_a2/}
}
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Arif S. Dzhafarov. Certain direct and inverse theorems in the theory of best approximations of functions by algebraic polynomials. Doklady Akademii Nauk, Tome 187 (1969) no. 4, pp. 719-722. http://geodesic.mathdoc.fr/item/DAN_1969_187_4_a2/