@article{MZM_1985_37_3_a4,
     author = {A. A. Ligun},
     title = {Constants in the {Jackson} theorem},
     journal = {Matemati\v{c}eskie zametki},
     pages = {326--336},
     publisher = {mathdoc},
     volume = {37},
     number = {3},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1985_37_3_a4/}
}