@article{05312546, title = {Generalized Hyers-Ulam stability of quadratic functional equations: a fixed point approach.}, journal = {Fixed Point Theory and Applications [electronic only]}, volume = {2008}, year = {2008}, doi = {10.1155/2008/493751}, zbl = {1146.39048}, language = {en}, url = {http://dml.mathdoc.fr/item/05312546} }
Park, Choonkil. Generalized Hyers-Ulam stability of quadratic functional equations: a fixed point approach.. Fixed Point Theory and Applications [electronic only], Tome 2008 (2008) . doi : 10.1155/2008/493751. http://gdmltest.u-ga.fr/item/05312546/