Rough sets and current trends in computing : 6th International Conference, RSCTC 2008 : Akron, OH, USA, October 23-25, 2008 : proceedings - Chan, Chien-Chung; Grzymala-Busse, Jerzy W., 1942-; Ziarko, Wojciech, 1951- (Lecture notes in computer science. Lecture notes in artificial intelligence ;, 2008)