@article{GDZPPN00240690X, title = {Inversions in Finite M\"obius Planes of Even Order.}, journal = {Mathematische Zeitschrift}, volume = {114}, year = {1970}, pages = {1-7}, zbl = {0194.51402}, url = {http://dml.mathdoc.fr/item/GDZPPN00240690X} }
Cofman, Judita. Inversions in Finite Möbius Planes of Even Order.. Mathematische Zeitschrift, Tome 114 (1970) pp. 1-7. http://gdmltest.u-ga.fr/item/GDZPPN00240690X/