@article{10_14708_cm_v16i1_5727,
     author = {E. Chandra},
     title = {N\"orlund summability of the derived series of {Fourier} series},
     journal = {Commentationes Mathematicae},
     pages = { 91--98},
     publisher = {mathdoc},
     volume = {16},
     number = {1},
     year = {1972},
     doi = {10.14708/cm.v16i1.5727},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v16i1.5727/}
}