TY - JOUR AU - S. P. Baiborodov TI - Approximation of functions of several variables by de la Vall\'ee Poussin rectangular sums JO - Matematičeskie zametki PY - 1981 SP - 711 EP - 730 VL - 29 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1981_29_5_a5/ LA - ru ID - MZM_1981_29_5_a5 ER -