@article{CMH_1936__9_138685,
     author = {Johann Jakob Burckhardt},
     title = {Bewegungsgruppen in mehrdimensionalen {R\"aumen.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {284--302},
     year = {1936},
     volume = {9},
     zbl = {0016.39402},
     url = {http://geodesic.mathdoc.fr/item/CMH_1936__9_138685/}
}