1. Fuzzy power sets and fuzzy implication operations;Bandler;Fuzzy Sets and Systems,1980
2. Decision making in a fuzzy environment;Bellman;Management Science,1970
3. Local and fuzzy logies;Bellman,1977
4. A definition of non-probabilistic entropy in the setting of fuzzy sets theory;De Luca;Information and Control,1972
5. Triangular norms for fuzzy sets;Dubois,1981