1. Fuzzy groups redefined;Anthony;Journal of Mathematical Analysis and Applications,1979
2. Fuzzy relational products as a tool for analysis and synthesis of the behaviour of complex natural and artificial systems;Bandler,1980
3. Special properties, closures and interiors of crisp and fuzzy relations;Bandler;Fuzzy Sets and Systems,1988
4. Cuts commute with closures;Bandler,1991
5. Fuzzy subgroups: some characterizations;Bhattacharya;Journal of Mathematical Analysis and Applications,1987