Geodesic
Jackson's inequality for mean-square approximations of periodic functions by trigonometric polynomials on a uniform grid
Matematičeskie zametki, Tome 43 (1988) no. 4, pp. 460-473.

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     author = {A. G. Babenko},
     title = {Jackson's inequality for mean-square approximations of periodic functions by trigonometric polynomials on a uniform grid},
     journal = {Matemati\v{c}eskie zametki},
     pages = {460--473},
     publisher = {mathdoc},
     volume = {43},
     number = {4},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1988_43_4_a3/}
}
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A. G. Babenko. Jackson's inequality for mean-square approximations of periodic functions by trigonometric polynomials on a uniform grid. Matematičeskie zametki, Tome 43 (1988) no. 4, pp. 460-473. http://geodesic.mathdoc.fr/item/MZM_1988_43_4_a3/