@article{GDZPPN002030667,
title = {The functional equation of distance preservance in spaces over rings.},
journal = {Aequationes mathematicae},
volume = {15},
year = {1977},
pages = {303-308},
zbl = {0368.39003},
url = {http://dml.mathdoc.fr/item/GDZPPN002030667}
}
Benz, Walter. The functional equation of distance preservance in spaces over rings.. Aequationes mathematicae, Tome 15 (1977) pp. 303-308. http://gdmltest.u-ga.fr/item/GDZPPN002030667/