数据挖掘的讲义，里面有粗糙集等等各处搜集到的相关论文-Data mining lecture notes, which have rough sets, etc. to collect the relevant papers everywhere. .

this paper reviews and compares theories of fuzzy sets and rough sét. Two approaches for the formulation of fuzzy sets are reviewed, one is base on many-valued logic and the other is based on model logic-this paper reviews and compares theories of fu

CONCEPT APPROXIMA TIONS BASED ON ROUGH SETS AND SIMILARITY MEASURES