Rough Sets, Fuzzy Sets and Knowledge Discovery Proceedings of the International Workshop on Rough Sets and Knowledge Discovery (RSKD’93), Banff, Alberta, Canada, 12–15 October 1993 Ziarko Wojciech P. Heftet / 1994 / Engelsk
Rough Sets and Current Trends in Computing 6th International Conference, RSCTC 2008 Akron, OH, USA, October 23 - 25, 2008 Proceedings Chan Chien-Chung Heftet / 2008 / Engelsk
