1. Algebraic structures of rough sets;Bonikowski,1995
2. The models of variable precision multigranulation rough sets;Dou;RSKT 2012, LNCS 7414,2012
3. Putting rough sets and fuzzy sets together;Dubois,1992
4. Pattern classification and scene analysis;Duda,1973
5. An introduction to probability, decision and inference;Lavalle,1970