@article{GDZPPN002550326,
title = {On a functional equation arising from hyperbolic geometry.},
journal = {Aequationes mathematicae},
volume = {20},
year = {1980},
pages = {113-119},
zbl = {0443.39005},
url = {http://dml.mathdoc.fr/item/GDZPPN002550326}
}
Benz, Walter. On a functional equation arising from hyperbolic geometry.. Aequationes mathematicae, Tome 20 (1980) pp. 113-119. http://gdmltest.u-ga.fr/item/GDZPPN002550326/