@article{AM2_1980__20_182394,
     author = {Pl. Kannappan},
     title = {On some generalized functional equations in information theory.},
     journal = {Aequationes mathematicae},
     pages = {149--158},
     publisher = {mathdoc},
     volume = {20},
     year = {1980},
     zbl = {0439.39003},
     url = {http://geodesic.mathdoc.fr/item/AM2_1980__20_182394/}
}