%0 Journal Article %A Ralph Hugh Francis Denniston %T Uniqueness of the Inversive Plane of Order 7. %J Manuscripta mathematica %D 1973 %P 21-26 %V 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/MM2_1973__8_154131/ %F MM2_1973__8_154131