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@article{AM2_1980__21_182422, author = {Walter Benz}, title = {On a functional equation arising from hyperbolic geometry.}, journal = {Aequationes mathematicae}, pages = {113--119}, publisher = {mathdoc}, volume = {21}, year = {1980}, zbl = {0443.39005}, url = {http://geodesic.mathdoc.fr/item/AM2_1980__21_182422/} }
Walter Benz. On a functional equation arising from hyperbolic geometry.. Aequationes mathematicae, Tome 21 (1980), pp. 113-119. http://geodesic.mathdoc.fr/item/AM2_1980__21_182422/