@article{AM2_1981__22_136860,
     author = {J. Acz\'el},
     title = {Notes on generalized information functions.},
     journal = {Aequationes mathematicae},
     pages = {97--107},
     publisher = {mathdoc},
     volume = {22},
     year = {1981},
     url = {http://geodesic.mathdoc.fr/item/AM2_1981__22_136860/}
}