TY - JOUR AU - A. Hinkkanen TI - Reality of zeros of derivatives of meromorphic functions JO - Annales Fennici Mathematici PY - 1997 SP - 21 EP - 38 VL - 22 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/AFM_1997_22_1_a2/ LA - en ID - AFM_1997_22_1_a2 ER -