%0 Journal Article
%A Walter Benz
%T On a general principle in geometry that leads to functional equations.
%J Aequationes mathematicae
%D 1993
%P 3-10
%V 46
%N 2-3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM2_1993__46_2-3_137535/
%F AM2_1993__46_2-3_137535