@article{JRAM_1857__54_147704,
     author = {R. Lipschitz},
     title = {Zur {Theorie} der quadratischen {Formen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {193--196},
     year = {1857},
     volume = {54},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1857__54_147704/}
}