1. On Measures of Information and Their Characterizations;Aczel,1975
2. An Introduction to Cybernetics;Ashby,1975
3. On the notion of ‘useful information’;Bongard,1963
4. Science and Information Theory;Brillouin,1956
5. A definition of a nonprobabilistic entropy in the setting of fuzzy set theory;De Luca;Inform. and Control,1972