Geodesic
Order of $(C,\alpha)$-approximations on certain classes of periodic functions
Matematičeskie zametki, Tome 15 (1974) no. 1, pp. 15-20

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In the spaces $L_{2\pi}$ and $C_{2\pi}$, the orders of upper bounds for the deviations of a function and its conjugate from the Cesaro means of their Fourier series are obtained on a class of functions with a given majorant of their k-th modulus of smoothness. 
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     author = {V. \`E. Gheit},
     title = {Order of $(C,\alpha)$-approximations on certain classes of periodic functions},
     journal = {Matemati\v{c}eskie zametki},
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     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_15_1_a1/}
}
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V. È. Gheit. Order of $(C,\alpha)$-approximations on certain classes of periodic functions. Matematičeskie zametki, Tome 15 (1974) no. 1, pp. 15-20. http://geodesic.mathdoc.fr/item/MZM_1974_15_1_a1/