@article{AM2_1982__24_136936,
     author = {Gian Luigi Forti},
     title = {On an alternative functional equation related to the {Cauchy} equation.},
     journal = {Aequationes mathematicae},
     pages = {195--206},
     year = {1982},
     volume = {24},
     zbl = {0517.39007},
     url = {http://geodesic.mathdoc.fr/item/AM2_1982__24_136936/}
}