@article{10_4064_ap_27_1_9_20,
     author = {Z. U. Ahmad},
     title = {Absolute {N\"orlund} summability factors of power series and {Fourier} series},
     journal = {Annales Polonici Mathematici},
     pages = {9--20},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {1972},
     doi = {10.4064/ap-27-1-9-20},
     language = {de},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-27-1-9-20/}
}