Yuejun Zhang Kinshuk Øyvind Smestad Jingyu Yang Lynn Jeffrey Using Agents for Enhancing Learning Effects in an Advanced Discussion Forum. 157-164 2006 ICCE conf/icce/2006 db/conf/icce/icce2006.html#ZhangKSYJ06 http://www.booksonline.iospress.nl/Content/View.aspx?piid=2254