Geodesic
Approximation of periodic functions by Fejer--Zygmund means in various metrics
Matematičeskie zametki, Tome 48 (1990) no. 4, pp. 48-57.

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     author = {N. A. Il'yasov},
     title = {Approximation of periodic functions by {Fejer--Zygmund} means in various metrics},
     journal = {Matemati\v{c}eskie zametki},
     pages = {48--57},
     publisher = {mathdoc},
     volume = {48},
     number = {4},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_48_4_a5/}
}
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N. A. Il'yasov. Approximation of periodic functions by Fejer--Zygmund means in various metrics. Matematičeskie zametki, Tome 48 (1990) no. 4, pp. 48-57. http://geodesic.mathdoc.fr/item/MZM_1990_48_4_a5/