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@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/} }
J. Spilker; J. Dhombres. Über die Funktionalgleichung f(f(x)*f(y)) = f(x*y). (Short Communication).. Aequationes mathematicae, Tome 15 (1977), pp. 112-113. http://geodesic.mathdoc.fr/item/AM2_1977__15_136637/