@article{GDZPPN002036657, title = {The fundamental equation of information and its generalizations.}, journal = {Aequationes mathematicae}, volume = {33}, year = {1987}, pages = {150-182}, zbl = {0658.94006}, url = {http://dml.mathdoc.fr/item/GDZPPN002036657} }
Sander, Wolfgang. The fundamental equation of information and its generalizations.. Aequationes mathematicae, Tome 33 (1987) pp. 150-182. http://gdmltest.u-ga.fr/item/GDZPPN002036657/