1. Local and fuzzy logics;Bellman,1977
2. Upper and lower probabilities induced by a multivalued mapping;Dempster;Annals of Mathematical Statistics,1967
3. Theory of Probability;de Finetti,1974
4. Foundations for quantum mechanics;Giles;Journal of Mathematical Physics,1970
5. Łukasiewicz logic and fuzzy set theory;Giles;International Journal of Man-Machine Studies,1976