@article{MAN_1923__90_159024,
     author = {A. M\"uller},
     title = {\"Uber {Zahlen} als {Zeichen}},
     journal = {Mathematische Annalen},
     pages = {153--158},
     publisher = {mathdoc},
     volume = {90},
     year = {1923},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1923__90_159024/}
}