@article{AM2_1997__54_3_137695,
     author = {Costanza Borelli},
     title = {On {Hyers-Ulam} stability for a class of functional equations.},
     journal = {Aequationes mathematicae},
     pages = {74--86},
     publisher = {mathdoc},
     volume = {54},
     number = {3},
     year = {1997},
     zbl = {0879.39009},
     url = {http://geodesic.mathdoc.fr/item/AM2_1997__54_3_137695/}
}