Geodesic
The order of approximation of a~continuous $2\pi$-periodic function by linear methods
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 10 (1969), pp. 40-50.

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@article{IVM_1969_10_a5,
     author = {V. V. Zhuk},
     title = {The order of approximation of a~continuous $2\pi$-periodic function by linear methods},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {40--50},
     publisher = {mathdoc},
     number = {10},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1969_10_a5/}
}
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V. V. Zhuk. The order of approximation of a~continuous $2\pi$-periodic function by linear methods. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 10 (1969), pp. 40-50. http://geodesic.mathdoc.fr/item/IVM_1969_10_a5/