@article{GDZPPN002408090, title = {The Collineation Group.}, journal = {Mathematische Zeitschrift}, volume = {121}, year = {1971}, pages = {60-62}, zbl = {0193.21302}, url = {http://dml.mathdoc.fr/item/GDZPPN002408090} }
Iden, Oddvar. The Collineation Group.. Mathematische Zeitschrift, Tome 121 (1971) pp. 60-62. http://gdmltest.u-ga.fr/item/GDZPPN002408090/