Liqiang Geng Larry Korba Yunli Wang Xin Wang Yonghua You Finding Topics in Email Using Formal Concept Analysis and Fuzzy Membership Functions. 108-113 2008 Canadian Conference on AI http://dx.doi.org/10.1007/978-3-540-68825-9_11 conf/ai/2008 db/conf/ai/ai2008.html#GengKWWY08