Rough Sets, Fuzzy Sets, Data Mining and Granular Computing 13th International Conference, RSFDGrC 2011, Moscow, Russia, June 25-27, 2011. Proceedings - Kuznetsov, Sergei O.; Ślęzak, Dominik; Hepting, Daryl H.; Mirkin, Boris G. (Springer Berlin Heidelberg, 2011)