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@article{AM2_1987__33_137210, author = {Wolfgang Sander}, title = {The fundamental equation of information and its generalizations.}, journal = {Aequationes mathematicae}, pages = {150--182}, publisher = {mathdoc}, volume = {33}, year = {1987}, zbl = {0658.94006}, url = {http://geodesic.mathdoc.fr/item/AM2_1987__33_137210/} }
Wolfgang Sander. The fundamental equation of information and its generalizations.. Aequationes mathematicae, Tome 33 (1987), pp. 150-182. http://geodesic.mathdoc.fr/item/AM2_1987__33_137210/