@article{AM2_1976__14_136562,
     author = {C.F.K. Jung and V. Boonyasombat},
     title = {On the functional equation f(x +f(y)) = f(x)f(y).},
     journal = {Aequationes mathematicae},
     pages = {41--48},
     publisher = {mathdoc},
     volume = {14},
     year = {1976},
     zbl = {0322.39021},
     url = {http://geodesic.mathdoc.fr/item/AM2_1976__14_136562/}
}