@article{MAN_1905__60_158207,
     author = {G. Scheffers},
     title = {Isogonalkurven, {\"Aquitangentialkurven} und komplexe {Zahlen.}},
     journal = {Mathematische Annalen},
     pages = {491--531},
     publisher = {mathdoc},
     volume = {60},
     year = {1905},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1905__60_158207/}
}