TY - JOUR AU - A. V. Efimov TI - Approximation of certain classes of continuous functions by Fourier sums and Fejer means JO - Doklady Akademii Nauk PY - 1957 SP - 930 EP - 933 VL - 114 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1957_114_5_a3/ LA - ru ID - DAN_1957_114_5_a3 ER -