Jingtao Yao, Yan Yang, Roman Slowinski, Salvatore Greco, Huaxiong Li, Sushmita Mitra, Lech Polkowski: Rough Sets and Current Trends in Computing - 8th International Conference, RSCTC 2012, Chengdu, China, August 17-20, 2012. Proceedings. Lecture Notes in Computer Science 7413, Springer 2012, ISBN 978-3-642-32114-6