@article{GDZPPN002408740, title = {Simple Groups and M\"obius Planes of Even Order.}, journal = {Mathematische Zeitschrift}, volume = {121}, year = {1971}, pages = {299-306}, zbl = {0231.05025}, url = {http://dml.mathdoc.fr/item/GDZPPN002408740} }
Cofman, Judita. Simple Groups and Möbius Planes of Even Order.. Mathematische Zeitschrift, Tome 121 (1971) pp. 299-306. http://gdmltest.u-ga.fr/item/GDZPPN002408740/