1. On relationships among fuzzy approximation operators, and fuzzy topology, and fuzzy automata;Arun;Fuzzy Sets and Systems,2003
2. Rough fuzzy set and fuzzy rough sets;Dubois;Internat. J. Gen. Systems,1990
3. Putting fuzzy sets and rough sets together;Dubois,1992
4. On extended fuzzy topologies;Gahler;Fuzzy Sets and Systems,2000
5. Constructive and axiomatic approaches for the study of the theory of rough sets;Jusheng Mi;Pattern Recognition Artificial Intelligence,2002