@article{AM2_1993__46_2-3_137540,
     author = {Janusz Brzdek},
     title = {On a generalization of the {Cauchy} functional equation.},
     journal = {Aequationes mathematicae},
     pages = {56--75},
     publisher = {mathdoc},
     volume = {46},
     number = {2-3},
     year = {1993},
     zbl = {0788.39004},
     url = {http://geodesic.mathdoc.fr/item/AM2_1993__46_2-3_137540/}
}