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