TY - JOUR AU - Nguen Tu Tkhan' TI - Approximation of functions by polynomials on sets with a multiply JO - Doklady Akademii Nauk PY - 1988 SP - 555 EP - 558 VL - 299 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1988_299_3_a8/ LA - ru ID - DAN_1988_299_3_a8 ER -