TY - JOUR AU - V. V. Zhuk TI - The order of approximation of a~continuous $2\pi$-periodic function by linear methods JO - Izvestiâ vysših učebnyh zavedenij. Matematika PY - 1969 SP - 40 EP - 50 IS - 10 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IVM_1969_10_a5/ LA - ru ID - IVM_1969_10_a5 ER -