TY - JOUR AU - K. Yu. Osipenko TI - The Carath\'eodory--Fej\'er problem and optimal recovery of derivatives in Hardy spaces JO - Sbornik. Mathematics PY - 1995 SP - 21 EP - 33 VL - 81 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SM_1995_81_1_a1/ LA - en ID - SM_1995_81_1_a1 ER -