Web Query Automatic Expansion Based on Tolerance Rough Set. - Gaoxiang Yi; Heping Hu (ICAS/ICNS, 2005)

Web Document Classification Based on Extended Rough set. - Gaoxiang Yi; Heping Hu; Zhengding Lu (PDCAT, 2005)

A User Interests-Sensitive Ranking Algorithm Based on Rough and Fuzzy Set. - Gaoxiang Yi; Lijun Wei; Yang Yu (SKG, 2007)