YunSong Qi Xibei Yang HuaiJiang Sun YuQing Song Dominance-Based Variable Precision Rough Fuzzy Approach in Fuzzy Information System. 8-12 2008 FSKD (5) http://dx.doi.org/10.1109/FSKD.2008.23 conf/fskd/2008-5 db/conf/fskd/fskd2008-5.html#QiYSS08