@article{GDZPPN002029243, title = {On the functional equation f(x +f(y)) = f(x)f(y).}, journal = {Aequationes mathematicae}, volume = {14}, year = {1976}, pages = {41-48}, zbl = {0322.39021}, url = {http://dml.mathdoc.fr/item/GDZPPN002029243} }
Jung, C.F.K.; Boonyasombat, V. On the functional equation f(x +f(y)) = f(x)f(y).. Aequationes mathematicae, Tome 14 (1976) pp. 41-48. http://gdmltest.u-ga.fr/item/GDZPPN002029243/