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[1] D. Dubois: Propriétés de la cardinalité floue d'un ensemble flou fini. BUSEFAL 5 (1981), P. Sabatier Univ., Toulouse, France, 11-12.
[2] D. Dubois: A new definition of the fuzzy cardinality of finite fuzzy sets preserving the classical additivity property. BUSEFAL 8 (1981), P. Sabatier Univ., Toulouse, France, 65-67.
[3] S. Gottwald: A note on fuzzy cardinals. Kybernetika 16 (1980), 156-158. MR 0575422 | Zbl 0434.03038
[4] M. Mizumoto, K. Tanaka: Some properties of fuzzy numbers. In: Advances in Fuzzy Set Theory and Applications (M. M. Gupta, R. K. Ragade, R. R. Yager, Eds.), North-Holland, Amsterdam 1979, 153-164. MR 0558721
[5] M. Wygralak: A few words on the importance of Jan Łukasiewicz works for fuzzy subsets theory. In: Proc. 8th Symp. on Numerical Methods and Appl. of Math., Academy of Economy Poznań, Poland (Sept., 1982), in print.
[6] M. Wygralak: On fuzzy cardinalities and fuzzy binomial coefficient. Fuzzy Sets and Systems (submitted).
[7] L. A. Zadeh: A theory of approximate reasoning. In: Machine Intelligence, Vol. 9. (J. E. Hayes, D. Michie, L. I. Mikulich, Eds.), John Wiley and Sons, New York 1979, 149- 194. MR 0582451
[8] L. A. Zadeh: Fuzzy probabilities and their role in decision analysis. In: Proc. IFAC Symp. on Theory and Appl. of Digital Control, New Delhi (January, 1982). Zbl 0532.90003
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