Geodesic
On the Jackson--Stechkin inequality for the best $L^2$-approximations of functions by trigonometric polynomials
Trudy Instituta matematiki i mehaniki, Approximation theory. Asymptotical expansions, Tome 7 (2001) no. 1, pp. 30-46

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     author = {A. G. Babenko},
     title = {On the {Jackson--Stechkin} inequality for the best $L^2$-approximations of functions by trigonometric polynomials},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {30--46},
     publisher = {mathdoc},
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     number = {1},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2001_7_1_a2/}
}
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A. G. Babenko. On the Jackson--Stechkin inequality for the best $L^2$-approximations of functions by trigonometric polynomials. Trudy Instituta matematiki i mehaniki, Approximation theory. Asymptotical expansions, Tome 7 (2001) no. 1, pp. 30-46. http://geodesic.mathdoc.fr/item/TIMM_2001_7_1_a2/