@article{JRAM_1907__132_149267,
     author = {Felix Bernstein},
     title = {Zur {Theorie} der trigonometrischen {Reihe.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {270--278},
     publisher = {mathdoc},
     volume = {132},
     year = {1907},
     zbl = {38.0440.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1907__132_149267/}
}