@article{10_4064_cm_8_1_77_79,
     author = {Stanis{\l}aw Hartman},
     title = {A remark about {Cauchy's} equation},
     journal = {Colloquium Mathematicum},
     pages = {77--79},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {1961},
     doi = {10.4064/cm-8-1-77-79},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-8-1-77-79/}
}