§. 56. Quadratische Formen
Lehrbuch der Algebra Bd. 1, GDML_Books, (1895), p. 179 / Harvested from
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     title = {\S . 56. Quadratische Formen},
     booktitle = {Lehrbuch der Algebra Bd. 1},
     series = {GDML\_Books},
     year = {1895},
     pages = {179},
     url = {http://dml.mathdoc.fr/item/PPN234729163+dmdlog70}
}

 (éd.). §. 56. Quadratische Formen, dans Lehrbuch der Algebra Bd. 1, GDML_Books,  (1895), p. 179. http://gdmltest.u-ga.fr/item/PPN234729163+dmdlog70/