1. The measure of the degree of truth and the grade of membership;Smets;Fuzzy Sets Syst.,1987
2. La logique moderne;Chauvineau,1980
3. Fuzzy Reasoning and Its Applications;Mamdani,1981
4. Logics for Artificial Intelligence;Turner,1984
5. A theory of approximate reasoning;Zadeh;Memorandum UCB/ERL M77/58,1977