@article{VSPUI_2015_1_a3,
     author = {V. V. Zhuk and O. A. Tumka and N. A. Kozlov},
     title = {Constants in {Jackson-type} inequations for the best approximation of periodic differentiable functions},
     journal = {Vestnik Sankt-Peterburgskogo universiteta. Prikladna\^a matematika, informatika, processy upravleni\^a},
     pages = {33--41},
     publisher = {mathdoc},
     number = {1},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSPUI_2015_1_a3/}
}