@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/