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@article{AM2_1995__50_1-2_137624, author = {Gian Luigi Forti}, title = {Hyers-Ulam stability of functional equations in several variables.}, journal = {Aequationes mathematicae}, pages = {143--190}, publisher = {mathdoc}, volume = {50}, number = {1-2}, year = {1995}, zbl = {0836.39007}, url = {http://geodesic.mathdoc.fr/item/AM2_1995__50_1-2_137624/} }
Gian Luigi Forti. Hyers-Ulam stability of functional equations in several variables.. Aequationes mathematicae, Tome 50 (1995) no. 1-2, pp. 143-190. http://geodesic.mathdoc.fr/item/AM2_1995__50_1-2_137624/