Geodesic
An extermal problem and linear methods of summation of Fourier series
Doklady Akademii Nauk, Tome 177 (1967) no. 2, pp. 265-267

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@article{DAN_1967_177_2_a3,
     author = {P. P. Korovkin},
     title = {An extermal problem and linear methods of summation of {Fourier} series},
     journal = {Doklady Akademii Nauk},
     pages = {265--267},
     publisher = {mathdoc},
     volume = {177},
     number = {2},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_177_2_a3/}
}
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P. P. Korovkin. An extermal problem and linear methods of summation of Fourier series. Doklady Akademii Nauk, Tome 177 (1967) no. 2, pp. 265-267. http://geodesic.mathdoc.fr/item/DAN_1967_177_2_a3/