@article{GDZPPN002041596,
title = {Hyers-Ulam stability of functional equations in several variables.},
journal = {Aequationes mathematicae},
volume = {49},
year = {1995},
pages = {143-190},
zbl = {0836.39007},
url = {http://dml.mathdoc.fr/item/GDZPPN002041596}
}
Forti, Gian Luigi. Hyers-Ulam stability of functional equations in several variables.. Aequationes mathematicae, Tome 49 (1995) pp. 143-190. http://gdmltest.u-ga.fr/item/GDZPPN002041596/