@article{AM2_1991__41_2-3_137407,
     author = {Thomas Riedel},
     title = {Cauchy's equation on ?.},
     journal = {Aequationes mathematicae},
     pages = {192--211},
     publisher = {mathdoc},
     volume = {41},
     number = {2-3},
     year = {1991},
     zbl = {0733.39012},
     url = {http://geodesic.mathdoc.fr/item/AM2_1991__41_2-3_137407/}
}