Geodesic
On the approximation of periodic functions by $(C,\alpha)$ means
Sbornik. Mathematics, Tome 49 (1984) no. 2, pp. 491-501 
M. M. Lekishvili. On the approximation of periodic functions by $(C,\alpha)$ means. Sbornik. Mathematics, Tome 49 (1984) no. 2, pp. 491-501. http://geodesic.mathdoc.fr/item/SM_1984_49_2_a12/
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     title = {On the approximation of periodic functions by $(C,\alpha)$ means},
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     url = {http://geodesic.mathdoc.fr/item/SM_1984_49_2_a12/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

This paper considers the problem of obtaining the principal term in the deviations of periodic functions in the space $L_p([-\pi,\pi])$, $1\leqslant p\leqslant\infty$, from their Cesàro means of arbitrary order. Bibliography: 7 titles.

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[4] Guo-Zhu-Rui, “Approximations of a continuous functions by Cesaro means of its Fouriers series”, Scintia Sinica, 11 (1962), 1625–1634 | MR

[5] Lebed G. K., Avdeenko A. A., “O priblizhenii periodicheskikh funktsii summami Feiera”, Izv. AN SSSR. Seriya matem., 35 (1971), 83–92 | MR | Zbl

[6] Zhizhiashvili L. V., Sopryazhennye funktsii i trigonometricheskie ryady, Izd-vo TGU, Tbilisi, 1969 | MR

[7] Fikhtengolts G. M., Kurs differentsialnogo i integralnogo ischisleniya, T. II, M., 1966