@article{AM2_1988__36_2-3_137275,
     author = {Zbigniew Gajda},
     title = {On stability of the {Cauchy} equation on semigroups.},
     journal = {Aequationes mathematicae},
     pages = {76--79},
     publisher = {mathdoc},
     volume = {36},
     number = {2-3},
     year = {1988},
     zbl = {0658.39006},
     url = {http://geodesic.mathdoc.fr/item/AM2_1988__36_2-3_137275/}
}