@article{GDZPPN002028115, title = {On the Functional Equation f(x)g(y) = ...hi(aix + biy).}, journal = {Aequationes mathematicae}, volume = {10}, year = {1974}, pages = {154-162}, url = {http://dml.mathdoc.fr/item/GDZPPN002028115} }
Baker, John A. On the Functional Equation f(x)g(y) = ...hi(aix + biy).. Aequationes mathematicae, Tome 10 (1974) pp. 154-162. http://gdmltest.u-ga.fr/item/GDZPPN002028115/