@article{MAN_1902__55_158052,
     author = {K.Th. Vahlen},
     title = {Ueber {Bewegungen} und complexe {Zahlen}},
     journal = {Mathematische Annalen},
     pages = {585--593},
     publisher = {mathdoc},
     volume = {55},
     year = {1902},
     zbl = {33.0721.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1902__55_158052/}
}