%0 Journal Article
%A Walter Benz
%T The functional equation of distance preservance in spaces over rings.
%J Aequationes mathematicae
%D 1977
%P 303-308
%V 16
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM2_1977__16_136702/
%F AM2_1977__16_136702