On Cesaro means of Fourier series with respect to multiplicative systems
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (1982), pp. 7-11

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Some estimates are given for the approximations of functions $f\in\operatorname{Lip}(\alpha,p)$, $0\alpha\le1$, $1\le p\le\infty$, by $(C,\beta)$-means of the partial sums of their Fourier series with respect to multiplicative orthogonal systems.
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     author = {V. A. Skvortsov},
     title = {On {Cesaro} means of {Fourier} series with respect to multiplicative systems},
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V. A. Skvortsov. On Cesaro means of Fourier series with respect to multiplicative systems. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (1982), pp. 7-11. http://geodesic.mathdoc.fr/item/VMUMM_1982_1_a1/