@article{JRAM_1910__138_149327,
     author = {Leopold Fej\'er},
     title = {Lebesguessche {Konstanten} und divergente {Fourierreihen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {22--53},
     publisher = {mathdoc},
     volume = {138},
     year = {1910},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1910__138_149327/}
}