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2. Operations in a fuzzy-valued logic;Dubois;Inform. and Control,1979
3. Fuzzy Sets and Systems: Theory and Applications;Dubois,1980
4. Twofold fuzzy sets: An approach to the representation of sets with fuzzy boundaries based on possibility and necessity measures;Dubois;J. Fuzzy Math. (China),1983
5. Fuzzy cardinality and the modeling of imprecise quantification;Dubois;Fuzzy Sets and Systems,1985