1. Individual Choice Behavior;Luce,1959
2. Psychology of Judgement and Choice;Restle,1961
3. Fuzzy sets;Zadeh,1965
4. L. A. Zadeh, “Fuzzy Sets and Systems,” Proceedings of the 1965 Symposium on System Theory, Brooklyn, New York, 29–39.
5. Abstraction and pattern classification;Bellman;J. Math. Anal. Appl.,1966