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@article{AM2_1977__16_136671, author = {A. Lundberg}, title = {On the functional equation f(...(x) + g(y)) = ...(x) * h(x+y).}, journal = {Aequationes mathematicae}, pages = {21--30}, publisher = {mathdoc}, volume = {16}, year = {1977}, zbl = {0433.39011}, url = {http://geodesic.mathdoc.fr/item/AM2_1977__16_136671/} }
A. Lundberg. On the functional equation f(...(x) + g(y)) = ...(x) * h(x+y).. Aequationes mathematicae, Tome 16 (1977), pp. 21-30. http://geodesic.mathdoc.fr/item/AM2_1977__16_136671/