@article{01533315, title = {Quadratic functional equations of Pexider type.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {23}, year = {2000}, pages = {351-359}, doi = {10.1155/S0161171200004075}, zbl = {0964.39021}, language = {en}, url = {http://dml.mathdoc.fr/item/01533315} }
Jung, Soon-Mo. Quadratic functional equations of Pexider type.. International Journal of Mathematics and Mathematical Sciences, Tome 23 (2000) pp. 351-359. doi : 10.1155/S0161171200004075. http://gdmltest.u-ga.fr/item/01533315/