@article{AM2_1995__49_1-2_182478,
     author = {Kazimierz Nikodem and Szymon Wasowicz},
     title = {A sandwich theorem and {Hyers-Ulam} stability of affine functions.},
     journal = {Aequationes mathematicae},
     pages = {160--164},
     publisher = {mathdoc},
     volume = {49},
     number = {1-2},
     year = {1995},
     zbl = {0815.39010},
     url = {http://geodesic.mathdoc.fr/item/AM2_1995__49_1-2_182478/}
}