TY - JOUR AU - È. A. Storozhenko TI - The rapidity of approximation of functions by the de la Vall\'ee Poussin means of their orthogonal expansions JO - Matematičeskie zametki PY - 1967 SP - 175 EP - 186 VL - 2 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1967_2_2_a7/ LA - ru ID - MZM_1967_2_2_a7 ER -