3Peng-Kiat Pek, Kim-Leng Poh. Using Decision Networks for Adaptive Tutoring [DB/OL]. http://www.eric.ed.gov/ERICDocs/data/ ericdocs2sql/content_storage_01/0000019b/80/17/2a/8e.pdf.
4Yujian Zhou Martha W. Evens. A Practical Student Model in an Intelligent Tutoring System [DB/OL]. http://www.cs.iit.edu/-circsim/ documents/yzitai99.pdf.
5Mia K. Stern and Beverly Park Woolf. Curriculum Sequencing in a Web -based Tutor [DB/OL]. http://www.springerlink.com/index/ 4MBNT2BNUMKB3A2G.pdf.