Geodesic
The exact constant in the Jackson inequality in $L^2$
Matematičeskie zametki, Tome 39 (1986) no. 5, pp. 651-664 
A. G. Babenko. The exact constant in the Jackson inequality in $L^2$. Matematičeskie zametki, Tome 39 (1986) no. 5, pp. 651-664. http://geodesic.mathdoc.fr/item/MZM_1986_39_5_a3/
@article{MZM_1986_39_5_a3,
     author = {A. G. Babenko},
     title = {The exact constant in the {Jackson} inequality in $L^2$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {651--664},
     year = {1986},
     volume = {39},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1986_39_5_a3/}
}
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