@article{GMJ_2003__10_3_51189,
     author = {Elqorachi, Elhoucien and Akkouchi, Mohamed},
     title = {The superstability of the generalized {d'Alembert} functional equation.},
     journal = {Georgian Mathematical Journal},
     pages = {503--508},
     publisher = {mathdoc},
     volume = {10},
     number = {3},
     year = {2003},
     zbl = {1058.39021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/GMJ_2003__10_3_51189/}
}