TY  - JOUR
AU  - C. Alsina
AU  - J.L. Garcia-Roig
TI  - On a functional equation related to the Ptolemaic inequality.
JO  - Aequationes mathematicae
PY  - 1987
SP  - 298
EP  - 303
VL  - 34
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AM2_1987__34_137247/
ID  - AM2_1987__34_137247
ER  -