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@article{MZ_1972__126_171723, author = {Robert Liebler}, title = {A {Characterization} of the {L\"uneburg} {Planes.}}, journal = {Mathematische Zeitschrift}, pages = {82--90}, publisher = {mathdoc}, volume = {126}, year = {1972}, zbl = {0229.50028}, url = {http://geodesic.mathdoc.fr/item/MZ_1972__126_171723/} }
Robert Liebler. A Characterization of the Lüneburg Planes.. Mathematische Zeitschrift, Tome 126 (1972), pp. 82-90. http://geodesic.mathdoc.fr/item/MZ_1972__126_171723/