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@article{AM2_1978__18_136793, author = {Wolfgang Sander}, title = {Verallgemeinerte {Cauchy-Funktionalgleichungen.}}, journal = {Aequationes mathematicae}, pages = {357--369}, publisher = {mathdoc}, volume = {18}, year = {1978}, zbl = {0397.39013}, url = {http://geodesic.mathdoc.fr/item/AM2_1978__18_136793/} }
Wolfgang Sander. Verallgemeinerte Cauchy-Funktionalgleichungen.. Aequationes mathematicae, Tome 18 (1978), pp. 357-369. http://geodesic.mathdoc.fr/item/AM2_1978__18_136793/