@article{JRAM_1883__94_148525,
     author = {R. Baltzer},
     title = {Ueber die {Einf\"uhrung} der complexen {Zahlen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {87--92},
     publisher = {mathdoc},
     volume = {94},
     year = {1883},
     zbl = {15.0022.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1883__94_148525/}
}