%0 Journal Article
%A C. Alsina
%A J.L. Garcia-Roig
%T On a functional equation related to the Ptolemaic inequality.
%J Aequationes mathematicae
%D 1987
%P 298-303
%V 34
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM2_1987__34_137247/
%F AM2_1987__34_137247