@article{TIMM_2009_15_1_a4,
     author = {A. G. Babenko and Yu. V. Kryakin},
     title = {Integral approximation of the characteristic function of an interval and the {Jackson} inequality in $C(\mathbb T)$},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {59--65},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2009_15_1_a4/}
}