@article{MZM_1971_10_6_a1,
     author = {P. V. Galkin},
     title = {On the modulus of continuity of the operator of best approximation in the space of continuous functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {601--613},
     publisher = {mathdoc},
     volume = {10},
     number = {6},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_10_6_a1/}
}