1. The Concept of a Linguistic Variable and its Applications to Approximate Reasoning;Zadeh,1973
2. Fuzzy Theories on Decision Making;Kickert,1978
3. Deductive verbal models of organization;Wenstøp;Int. J. Man–Mach. Stud.,1976
4. Fuzzy Sets and Systems: Theory and Applications;Dubois,1980
5. Analysis and synthesis of fuzzy systems by the use of probabilistic sets;Hirota;Fuzzy Sets Syst.,1983