@article{JRAM_1867__67_148013,
     author = {Paul Bachmann},
     title = {Zur {Theorie} der complexen {Zahlen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {200--204},
     publisher = {mathdoc},
     volume = {67},
     year = {1867},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1867__67_148013/}
}