@article{GDZPPN002258692, title = {The hyperorthogonal groups}, journal = {Mathematische Annalen}, volume = {55}, year = {1902}, pages = {521-572}, zbl = {33.0151.02}, url = {http://dml.mathdoc.fr/item/GDZPPN002258692} }
Dickson, Leonard Eugen. The hyperorthogonal groups. Mathematische Annalen, Tome 55 (1902) pp. 521-572. http://gdmltest.u-ga.fr/item/GDZPPN002258692/