1. Introduction to Many-valued Logics;Ackerman,1967
2. Social Choice and Individual Values;Arrow,1963
3. On the analytic formalism of the theory of fuzzy sets;Bellman;University of Southern California, Technical Report No. 7100,1971
4. Local and fuzzy logics;Bellman,1976
5. Lattice theory;Birkhoff;Amer. Math. Soc. Colloq. Publ.,1967