Geodesic
Approximation of differentiable functions by positive methods of summation of Fourier series
Matematičeskie zametki, Tome 34 (1983) no. 4, pp. 515-519.

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     author = {V. A. Levin},
     title = {Approximation of differentiable functions by positive methods of summation of {Fourier} series},
     journal = {Matemati\v{c}eskie zametki},
     pages = {515--519},
     publisher = {mathdoc},
     volume = {34},
     number = {4},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1983_34_4_a3/}
}
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V. A. Levin. Approximation of differentiable functions by positive methods of summation of Fourier series. Matematičeskie zametki, Tome 34 (1983) no. 4, pp. 515-519. http://geodesic.mathdoc.fr/item/MZM_1983_34_4_a3/