@article{GDZPPN002035243,
title = {The general solution of a functional equation in two variables.},
journal = {Aequationes mathematicae},
volume = {28},
year = {1985},
pages = {7-13},
zbl = {0593.39007},
url = {http://dml.mathdoc.fr/item/GDZPPN002035243}
}
Forti, Gian Luigi. The general solution of a functional equation in two variables.. Aequationes mathematicae, Tome 28 (1985) pp. 7-13. http://gdmltest.u-ga.fr/item/GDZPPN002035243/