TY - JOUR AU - A. P. Petukhov TI - On approximation of functions by singular integrals in the Hausdorff metric JO - Sbornik. Mathematics PY - 1989 SP - 229 EP - 246 VL - 63 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SM_1989_63_1_a15/ LA - en ID - SM_1989_63_1_a15 ER -