Yong Se Kim Tae Bok Yoon Hyun Jin Cha Young Mo Jung Eric Wang Jee-Hyong Lee A Outliers Analysis of Learner's Data based on User Interface Behaviors. 935-936 2007 conf/icalt/2007 ICALT http://doi.ieeecomputersociety.org/10.1109/ICALT.2007.25 db/conf/icalt/icalt2007.html#KimYCJWL07