Wanpeng Song Liu Wenyin Naijie Gu Xiaojun Quan User Feedback for Improving Question Categorization in Web-Based Question Answering Systems. 148-159 2009 APWeb/WAIM Workshops http://dx.doi.org/10.1007/978-3-642-03996-6_15 conf/apweb/2009w db/conf/apweb/apweb2009w.html#SongWGQ09