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@article{AM2_1987__32_137189, author = {Istv\'an Feny\"o}, title = {On the hyperbolic linear functional equations.}, journal = {Aequationes mathematicae}, pages = {252--258}, publisher = {mathdoc}, volume = {32}, year = {1987}, zbl = {0623.39006}, url = {http://geodesic.mathdoc.fr/item/AM2_1987__32_137189/} }
István Fenyö. On the hyperbolic linear functional equations.. Aequationes mathematicae, Tome 32 (1987), pp. 252-258. http://geodesic.mathdoc.fr/item/AM2_1987__32_137189/