@article{GDZPPN002035219, title = {On a sum form functional equation.}, journal = {Aequationes mathematicae}, volume = {28}, year = {1985}, pages = {321-326}, zbl = {0576.39010}, url = {http://dml.mathdoc.fr/item/GDZPPN002035219} }
Sander, Wolfgang. On a sum form functional equation.. Aequationes mathematicae, Tome 28 (1985) pp. 321-326. http://gdmltest.u-ga.fr/item/GDZPPN002035219/