Geodesic
On the order of the approximation of functions by linear positive operators
Doklady Akademii Nauk, Tome 114 (1957) no. 6, pp. 1158-1161.

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     author = {P. P. Korovkin},
     title = {On the order of the approximation of functions by linear positive operators},
     journal = {Doklady Akademii Nauk},
     pages = {1158--1161},
     publisher = {mathdoc},
     volume = {114},
     number = {6},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_114_6_a5/}
}
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P. P. Korovkin. On the order of the approximation of functions by linear positive operators. Doklady Akademii Nauk, Tome 114 (1957) no. 6, pp. 1158-1161. http://geodesic.mathdoc.fr/item/DAN_1957_114_6_a5/