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@article{AM2_1985__28_137042, author = {Walter Benz}, title = {On mappings preserving a single {Lorentz-Minkowski-distance} in {Hjelmslev's} classical plane.}, journal = {Aequationes mathematicae}, pages = {80--87}, publisher = {mathdoc}, volume = {28}, year = {1985}, zbl = {0575.51009}, url = {http://geodesic.mathdoc.fr/item/AM2_1985__28_137042/} }
Walter Benz. On mappings preserving a single Lorentz-Minkowski-distance in Hjelmslev's classical plane.. Aequationes mathematicae, Tome 28 (1985), pp. 80-87. http://geodesic.mathdoc.fr/item/AM2_1985__28_137042/