Xue-feng Zhang Yutong Wang Qing-ling Zhang Bao-yan Zhu Design and Algorithms Realization of Rough Set Simulation Tool Box. 367-371 2007 FSKD (1) http://dx.doi.org/10.1109/FSKD.2007.240 conf/fskd/2007-1 db/conf/fskd/fskd2007-1.html#ZhangWZZ07