The Jackson--Stechkin inequality in $L^2$ with a~trigonometric modulus of continuity
Matematičeskie zametki, Tome 65 (1999) no. 6, pp. 928-932.

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     author = {A. G. Babenko and N. I. Chernykh and V. T. Shevaldin},
     title = {The {Jackson--Stechkin} inequality in $L^2$ with a~trigonometric modulus of continuity},
     journal = {Matemati\v{c}eskie zametki},
     pages = {928--932},
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     number = {6},
     year = {1999},
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     url = {http://geodesic.mathdoc.fr/item/MZM_1999_65_6_a14/}
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A. G. Babenko; N. I. Chernykh; V. T. Shevaldin. The Jackson--Stechkin inequality in $L^2$ with a~trigonometric modulus of continuity. Matematičeskie zametki, Tome 65 (1999) no. 6, pp. 928-932. http://geodesic.mathdoc.fr/item/MZM_1999_65_6_a14/

[1] Shevaldin V. T., Matem. zametki, 27:5 (1980), 721–740 | MR | Zbl

[2] Chernykh N. I., Matem. zametki, 2:5 (1967), 513–522 | MR

[3] Chernykh N. I., Tr. MIAN, 88, Nauka, M., 1967, 71–74 | MR

[4] Babenko A. G., Matem. zametki, 60:3 (1996), 333–355 | MR | Zbl