Geodesic
On the existence of a linear polynomial operator giving the best approximation on a class of functions
Doklady Akademii Nauk, Tome 143 (1962) no. 1, pp. 25-27.

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     author = {N. P. Korneichuk},
     title = {On the existence of a linear polynomial operator giving the best approximation on a class of functions},
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     url = {http://geodesic.mathdoc.fr/item/DAN_1962_143_1_a5/}
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N. P. Korneichuk. On the existence of a linear polynomial operator giving the best approximation on a class of functions. Doklady Akademii Nauk, Tome 143 (1962) no. 1, pp. 25-27. http://geodesic.mathdoc.fr/item/DAN_1962_143_1_a5/