@article{GDZPPN002279517, title = {Die Kollineationen des n-dimensionalen Raumes}, journal = {Mathematische Annalen}, volume = {115}, year = {1938}, pages = {80-86}, zbl = {0017.22003}, url = {http://dml.mathdoc.fr/item/GDZPPN002279517} }
Cohn-Vossen, St. Die Kollineationen des n-dimensionalen Raumes. Mathematische Annalen, Tome 115 (1938) pp. 80-86. http://gdmltest.u-ga.fr/item/GDZPPN002279517/