@article{DAN_1962_143_1_a5,
     author = {N. P. Korneichuk},
     title = {On the existence of a linear polynomial operator giving the best approximation on a class of functions},
     journal = {Doklady Akademii Nauk},
     pages = {25--27},
     publisher = {mathdoc},
     volume = {143},
     number = {1},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_143_1_a5/}
}