TY  - JOUR
AU  - Walter Benz
TI  - The functional equation of distance preservance in spaces over rings.
JO  - Aequationes mathematicae
PY  - 1977
SP  - 303
EP  - 308
VL  - 16
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AM2_1977__16_136702/
ID  - AM2_1977__16_136702
ER  -