@article{GDZPPN002216930, title = {Uniqueness of the Inversive Plane of Order 7.}, journal = {Manuscripta mathematica}, volume = {11}, year = {1973}, pages = {21-26}, zbl = {0251.05019}, url = {http://dml.mathdoc.fr/item/GDZPPN002216930} }
Denniston, Ralph Hugh Francis. Uniqueness of the Inversive Plane of Order 7.. Manuscripta mathematica, Tome 11 (1973) pp. 21-26. http://gdmltest.u-ga.fr/item/GDZPPN002216930/