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 
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/
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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},
     journal = {Doklady Akademii Nauk},
     pages = {25--27},
     year = {1962},
     volume = {143},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_143_1_a5/}
}
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