@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/