@article{MZM_1996_60_3_a1,
     author = {A. G. Babenko},
     title = {Sharp {Jackson{\textendash}Stechkin} inequality in $L^2$ for multidimensional spheres},
     journal = {Matemati\v{c}eskie zametki},
     pages = {333--355},
     year = {1996},
     volume = {60},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1996_60_3_a1/}
}