Rough Sets and Knowledge Technology 7th International Conference, RSKT 2012, Chengdu, China, August 17-20, 2012. Proceedings - Li, Tianrui; Nguyen, Hung Son; Wang, Guoyin; Grzymala-Busse, Jerzy; Janicki, Ryszard; Hassanien, Aboul Ella; Yu, Hong (Springer Berlin Heidelberg : Imprint: Springer, 2012)