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@article{AM2_1977__16_136702, author = {Walter Benz}, title = {The functional equation of distance preservance in spaces over rings.}, journal = {Aequationes mathematicae}, pages = {303--308}, publisher = {mathdoc}, volume = {16}, year = {1977}, zbl = {0368.39003}, url = {http://geodesic.mathdoc.fr/item/AM2_1977__16_136702/} }
Walter Benz. The functional equation of distance preservance in spaces over rings.. Aequationes mathematicae, Tome 16 (1977), pp. 303-308. http://geodesic.mathdoc.fr/item/AM2_1977__16_136702/