1. Berenji, H.R.: Fuzzy reinforcement learning and dynamic programming. In: Ralescu, A.L. (ed.) Fuzzy Logic in Artificial Intelligence, Proc. IJCAI 1993 Workshop, pp. 1–9. Springer, Berlin (1994)
2. Black, M.: Reasoning with loose concepts. Dialog 2, 1–12 (1963)
3. Bosch, P.: Vagueness, ambiguity and all the rest. In: Van de Velde, M., Vandeweghe, W. (eds.) Sprachstruktur, Individuum und Gesselschaft. Niemeyer, Tubingen (1978)
4. Bowen, J., Lai, R., Bahler, D.: Fuzzy semantics and fuzzy constraint networks. In: Proc. 1st IEEE Conf. on Fuzzy Systems, San Francisco, pp. 1009–1016 (1992)
5. Bowen, J., Lai, R., Bahler, D.: Lexical imprecision in fuzzy constraint networks. In: Proc. Nat. Conf. on Artificial Intelligence, pp. 616–620 (1992)