Chien-Chung Chan Jerzy W. Grzymala-Busse Wojciech Ziarko Rough Sets and Current Trends in Computing, 6th International Conference, RSCTC 2008, Akron, OH, USA, October 23-25, 2008, Proceedings 5306 2008 978-3-540-88423-1 RSCTC Lecture Notes in Computer Science Springer db/conf/rsctc/rsctc2008.html