%0 Journal Article
%A Walter Benz
%T The functional equation of distance preservance in spaces over rings. (Short Communication).
%J Aequationes mathematicae
%D 1977
%P 308-308
%V 15
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM2_1977__15_136663/
%F AM2_1977__15_136663