@article{10_4064_fm_50_4_387_391,
     author = {M. Kuczma},
     title = {On the functional equation f(x + y) {\textemdash} f(x) + f (y)},
     journal = {Fundamenta Mathematicae},
     pages = {387--391},
     publisher = {mathdoc},
     volume = {50},
     number = {4},
     year = {1961},
     doi = {10.4064/fm-50-4-387-391},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-50-4-387-391/}
}