TY - JOUR AU - V. V. Zhuk TI - On the order of approximation of a~continuous $2\pi$-periodic function by Fejer and Poisson means of its Fourier series JO - Matematičeskie zametki PY - 1968 SP - 21 EP - 32 VL - 4 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1968_4_1_a2/ LA - ru ID - MZM_1968_4_1_a2 ER -