@article{PORMA_1988__45_2_115615,
     author = {Sulaiman, W.T.},
     title = {On $|\overline{N}, p_n|_k$ summability factors of {Fourier} series},
     journal = {Portugaliae mathematica},
     pages = {115--124},
     publisher = {mathdoc},
     volume = {45},
     number = {2},
     year = {1988},
     mrnumber = {0952529},
     zbl = {0602.42008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1988__45_2_115615/}
}