Rough Sets, Fuzzy Sets, Data Mining and Granular Computing 12th International Conference, RSFDGrC 2009, Delhi, India, December 15-18, 2009. Proceedings - Sakai, Hiroshi; Chakraborty, Mihir Kumar; Hassanien, Aboul Ella; Ślęzak, Dominik; Zhu, William (Springer Berlin Heidelberg, 2009)