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@article{MAN_1902__55_158050, author = {Leonard Eugen Dickson}, title = {The hyperorthogonal groups}, journal = {Mathematische Annalen}, pages = {521--572}, publisher = {mathdoc}, volume = {55}, year = {1902}, zbl = {33.0151.02}, url = {http://geodesic.mathdoc.fr/item/MAN_1902__55_158050/} }
Leonard Eugen Dickson. The hyperorthogonal groups. Mathematische Annalen, Tome 55 (1902), pp. 521-572. http://geodesic.mathdoc.fr/item/MAN_1902__55_158050/