@article{02064655,
title = {The superstability of the generalized d'Alembert functional equation.},
journal = {Georgian Mathematical Journal},
volume = {10},
year = {2003},
pages = {503-508},
zbl = {1058.39021},
language = {en},
url = {http://dml.mathdoc.fr/item/02064655}
}
Elqorachi, Elhoucien; Akkouchi, Mohamed. The superstability of the generalized d'Alembert functional equation.. Georgian Mathematical Journal, Tome 10 (2003) pp. 503-508. http://gdmltest.u-ga.fr/item/02064655/