Byung-In Cho Joel A. Michael Allen A. Rovick Martha W. Evens A Curriculum Planning Model for an Intelligent Tutoring System. 197-201 1999 conf/flairs/1999 FLAIRS Conference db/conf/flairs/flairs1999.html#ChoMRE99 http://www.aaai.org/Library/FLAIRS/1999/flairs99-035.php