Two-sided estimates of the approximation of functions by Riesz and Marcinkiewicz means
Doklady Akademii Nauk, Tome 251 (1980) no. 1, pp. 34-36.

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     author = {O. I. Kuznetsova and R. M. Trigub},
     title = {Two-sided estimates of the approximation of functions by {Riesz} and {Marcinkiewicz} means},
     journal = {Doklady Akademii Nauk},
     pages = {34--36},
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     number = {1},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_251_1_a8/}
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O. I. Kuznetsova; R. M. Trigub. Two-sided estimates of the approximation of functions by Riesz and Marcinkiewicz means. Doklady Akademii Nauk, Tome 251 (1980) no. 1, pp. 34-36. http://geodesic.mathdoc.fr/item/DAN_1980_251_1_a8/