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@article{AM2_1985__29_137073, author = {F. Rad\'o}, title = {Mappings of {Galois} planes preserving the unit {Euclidean} distance.}, journal = {Aequationes mathematicae}, pages = {1--6}, publisher = {mathdoc}, volume = {29}, year = {1985}, zbl = {0581.51013}, url = {http://geodesic.mathdoc.fr/item/AM2_1985__29_137073/} }
F. Radó. Mappings of Galois planes preserving the unit Euclidean distance.. Aequationes mathematicae, Tome 29 (1985), pp. 1-6. http://geodesic.mathdoc.fr/item/AM2_1985__29_137073/