TY - JOUR AU - Z. U. Ahmad TI - Absolute Nörlund summability factors of power series and Fourier series JO - Annales Polonici Mathematici PY - 1972 SP - 9 EP - 20 VL - 27 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/ap-27-1-9-20/ DO - 10.4064/ap-27-1-9-20 LA - de ID - 10_4064_ap_27_1_9_20 ER -