@article{10_4064_ap_30_1_49_55,
     author = {Pl. Kannappan and M. Kuczma},
     title = {On a functional equation related to the {Cauchy} equation},
     journal = {Annales Polonici Mathematici},
     pages = {49--55},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1974},
     doi = {10.4064/ap-30-1-49-55},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-30-1-49-55/}
}