@article{AM2_1996__52_1-2_137669,
     author = {P. Volkmann and K. Baron and A. Simon},
     title = {On functions having {Cauchy} differences in some prescribed sets.},
     journal = {Aequationes mathematicae},
     pages = {254--259},
     publisher = {mathdoc},
     volume = {52},
     number = {1-2},
     year = {1996},
     zbl = {0861.39019},
     url = {http://geodesic.mathdoc.fr/item/AM2_1996__52_1-2_137669/}
}