%0 Journal Article %A Raymond W. Freese %T A 2-metric Characterization of the Euclidean Plane. %J Mathematische Annalen %D 1973 %P 285 %V 206 %I mathdoc %U https://geodesic-test.mathdoc.fr/item/MAN_1973__206_162522/ %G un %F MAN_1973__206_162522