@article{10_4064_ap_30_1_105_112,
     author = {P. Kannappan and C. T. Ng},
     title = {A functional equation and its application to information theory},
     journal = {Annales Polonici Mathematici},
     pages = {105--112},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1974},
     doi = {10.4064/ap-30-1-105-112},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-30-1-105-112/}
}