1. Rough sets and data mining analysis of imprecise data;Lin,1997
2. Rough sets theoretical aspects of reasoning about data;Pawlak,1991
3. Intelligent decision support handbook of application and advances of the rough sets theory;Slowinski,1992
4. Variable precision rough set theory and data discretisation;Beynon;Omega-International Journal of Management Science,2001
5. Variable precision rough set model;Ziarko;Journal of Computer and System Science,1993