@article{05237461, title = {On the stability of trigonometric functional equations.}, journal = {Advances in Difference Equations [electronic only]}, volume = {2007}, year = {2007}, doi = {10.1155/2007/90405}, zbl = {1148.39024}, language = {en}, url = {http://dml.mathdoc.fr/item/05237461} }
Kim, Gwang Hui. On the stability of trigonometric functional equations.. Advances in Difference Equations [electronic only], Tome 2007 (2007) . doi : 10.1155/2007/90405. http://gdmltest.u-ga.fr/item/05237461/