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