@article{PPN234729163+dmdlog78, title = {\S . 64. Biquadratische Formen}, booktitle = {Lehrbuch der Algebra Bd. 1}, series = {GDML\_Books}, year = {1895}, pages = {199}, url = {http://dml.mathdoc.fr/item/PPN234729163+dmdlog78} }
(éd.). §. 64. Biquadratische Formen, dans Lehrbuch der Algebra Bd. 1, GDML_Books, (1895), p. 199. http://gdmltest.u-ga.fr/item/PPN234729163+dmdlog78/