@article{MZM_1999_65_6_a14,
     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},
     publisher = {mathdoc},
     volume = {65},
     number = {6},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1999_65_6_a14/}
}