@article{GDZPPN002029758, title = {On the functional equation f(x) g(y) = p(x+y) q(x/y).}, journal = {Aequationes mathematicae}, volume = {14}, year = {1976}, pages = {493-506}, zbl = {0326.39008}, url = {http://dml.mathdoc.fr/item/GDZPPN002029758} }
Baker, John A. On the functional equation f(x) g(y) = p(x+y) q(x/y).. Aequationes mathematicae, Tome 14 (1976) pp. 493-506. http://gdmltest.u-ga.fr/item/GDZPPN002029758/