@article{MZ_1966__92_170547,
     author = {Heinz L\"uneburg},
     title = {On {M\"obius-Planes} of {Even} {Order.}},
     journal = {Mathematische Zeitschrift},
     pages = {187--193},
     year = {1966},
     volume = {92},
     zbl = {0138.41601},
     url = {http://geodesic.mathdoc.fr/item/MZ_1966__92_170547/}
}