1. Definition of general aggregation operators through similarity relations;Beliakov;Fuzzy Sets and Systems,2000
2. Fuzzy partitions and relations;Bezdek;Fuzzy Sets and Systems,1996
3. Approximation of fuzzy concepts in decision making;Bodjanova;Fuzzy Sets and Systems,1997
4. Towards general measures of comparison of objects;Bouchon-Meunier;Fuzzy Sets and Systems,1992
5. Fuzzy extension of rough set theory;Cattaneo,1998