@article{AM2_1977__15_136637,
     author = {J. Spilker and J. Dhombres},
     title = {\"Uber die {Funktionalgleichung} f(f(x)*f(y)) = f(x*y). {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {112--113},
     publisher = {mathdoc},
     volume = {15},
     year = {1977},
     zbl = {0335.39005},
     url = {http://geodesic.mathdoc.fr/item/AM2_1977__15_136637/}
}