@article{GDZPPN002397412, title = {The Dual L\"uneburg Planes.}, journal = {Mathematische Zeitschrift}, volume = {93}, year = {1966}, pages = {201-209}, zbl = {0178.23403}, url = {http://dml.mathdoc.fr/item/GDZPPN002397412} }
Ostrom, T.G. The Dual Lüneburg Planes.. Mathematische Zeitschrift, Tome 93 (1966) pp. 201-209. http://gdmltest.u-ga.fr/item/GDZPPN002397412/