@article{AM2_1991__41_2-3_137401,
     author = {Janusz Brzdek},
     title = {Subgroups of the {Clifford} group.},
     journal = {Aequationes mathematicae},
     pages = {123--135},
     year = {1991},
     volume = {41},
     number = {2-3},
     zbl = {0737.20021},
     url = {http://geodesic.mathdoc.fr/item/AM2_1991__41_2-3_137401/}
}