Sen Guo Yongsheng Liang Zhili Zhang Wei Liu Association Rule Retrieved from Web Log Based on Rough Set Theory. 129-135 2007 FSKD (3) http://dx.doi.org/10.1109/FSKD.2007.194 conf/fskd/2007-3 db/conf/fskd/fskd2007-3.html#GuoLZL07