@article{JRAM_1873__76_148227,
     author = {P. Bachmann},
     title = {Untersuchungen \"uber quadratische {Formen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {331--341},
     year = {1873},
     volume = {76},
     zbl = {05.0084.02},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1873__76_148227/}
}