1. Fuzzy partitions and relations; an axiomatic basis for clustering, 1978;Bezdek,1992
2. Fuzzy Models for Pattern Recognition,1992
3. Fuzzy Sets, Uncertainty, and Information;Klir,1988
4. Pattern classification based on fuzzy relations, 1971;Tamura,1992
5. Similarity relations and fuzzy orderings, 1971;Zadeh,1992