@article{MZ_1920__6_167560,
     author = {E., Jacobsthal},
     title = {Mittelwertbildung und {Reihentransformation}},
     journal = {Mathematische Zeitschrift},
     pages = {100--117},
     publisher = {mathdoc},
     volume = {6},
     year = {1920},
     zbl = {47.0201.02},
     url = {http://geodesic.mathdoc.fr/item/MZ_1920__6_167560/}
}