TY - JOUR AU - V. A. Nogin AU - S. G. Samko TI - On the simultaneous approximation of functions and their Riesz derivatives JO - Doklady Akademii Nauk PY - 1981 SP - 548 EP - 550 VL - 261 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1981_261_3_a7/ LA - ru ID - DAN_1981_261_3_a7 ER -