@article{DAN_1957_114_5_a3,
     author = {A. V. Efimov},
     title = {Approximation of certain classes of continuous functions by {Fourier} sums and {Fejer} means},
     journal = {Doklady Akademii Nauk},
     pages = {930--933},
     year = {1957},
     volume = {114},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_114_5_a3/}
}