@article{MZ_1961__76_169961,
     author = {Z.U. Ahmad},
     title = {On the absolute {Ces\`aro} summability factors of infinite series.},
     journal = {Mathematische Zeitschrift},
     pages = {295--310},
     publisher = {mathdoc},
     volume = {76},
     year = {1961},
     zbl = {0099.28002},
     url = {http://geodesic.mathdoc.fr/item/MZ_1961__76_169961/}
}