@article{DAN_1958_121_3_a1,
     author = {V. K. Dzyadyk},
     title = {A further strengthening of {Jackson's} theorem on the approximation of continuous functions by ordinary polynomials},
     journal = {Doklady Akademii Nauk},
     pages = {403--406},
     publisher = {mathdoc},
     volume = {121},
     number = {3},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_121_3_a1/}
}