@article{CMH_1932__4_138580,
     author = {Elie Cartan},
     title = {Sur le groupe de la g\'eom\'etrie hypersph\'erique.},
     journal = {Commentarii mathematici Helvetici},
     pages = {158--171},
     publisher = {mathdoc},
     volume = {4},
     year = {1932},
     zbl = {0005.11405},
     url = {http://geodesic.mathdoc.fr/item/CMH_1932__4_138580/}
}