@article{GDZPPN002308940, title = {A 2-metric Characterization of the Euclidean Plane.}, journal = {Mathematische Annalen}, volume = {201}, year = {1973}, pages = {285-294}, zbl = {0252.50001}, url = {http://dml.mathdoc.fr/item/GDZPPN002308940} }
Freese, Raymond W. A 2-metric Characterization of the Euclidean Plane.. Mathematische Annalen, Tome 201 (1973) pp. 285-294. http://gdmltest.u-ga.fr/item/GDZPPN002308940/