Geodesic
On the approximation of periodic functions by $(C,\alpha)$ means
Sbornik. Mathematics, Tome 49 (1984) no. 2, pp. 491-501 Cet article a éte moissonné depuis la source Math-Net.Ru

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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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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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