@article{ARM_2004_40_1_a0,
     author = {Rassias, John Michael},
     title = {Solution of a quadratic stability {Ulam} type problem},
     journal = {Archivum mathematicum},
     pages = {1--16},
     year = {2004},
     volume = {40},
     number = {1},
     mrnumber = {2054867},
     zbl = {1122.39023},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_2004_40_1_a0/}
}