@article{05236962,
title = {Stability problem of Ulam for Euler-Lagrange quadratic mappings.},
journal = {Journal of Inequalities and Applications [electronic only]},
volume = {2007},
year = {2007},
doi = {10.1155/2007/10725},
zbl = {1132.39024},
language = {en},
url = {http://dml.mathdoc.fr/item/05236962}
}
Kim, Hark-Mahn; Rassias, John Michael; Cho, Young-Sun. Stability problem of Ulam for Euler-Lagrange quadratic mappings.. Journal of Inequalities and Applications [electronic only], Tome 2007 (2007) . doi : 10.1155/2007/10725. http://gdmltest.u-ga.fr/item/05236962/