@article{AM2_1979__19_136814,
     author = {Pl. Kannappan},
     title = {On some generalized functional equations in information theory {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {116--116},
     publisher = {mathdoc},
     volume = {19},
     year = {1979},
     url = {http://geodesic.mathdoc.fr/item/AM2_1979__19_136814/}
}