1. The geometry tutor;Anderson,1985
2. The University of Virginia instructional toolkit: Making it easy to create course home pages on the World Wide Web;Ashmore,1996
3. Available: http://curry.edschool.Virginia.EDU/lha5w/toolkit-paper.html
4. Intelligent agents to support the effective collaboration in a CSCL environment;Ayala,1996
5. Adapting instructional design methods to intelligent multimedia authoring systems;Baker,1993