- J. Educ. Resour. Comput. (2001)
- ACM Trans. Comput.-Hum. Interact. 10(3):177--197 (September 2003)
- HYPERTEXT '05: Proceedings of the sixteenth ACM conference on Hypertext and hypermedia, page 184--192. New York, NY, USA, ACM Press, (2005)
- User Modeling and User-Adapted Interaction 13(3):213--267 (August 2003)
- User Modeling and User-Adapted Interaction 15(1):135--168 (March 2005)
- User Modeling and User-Adapted Interaction 15(5):459--495 (November 2005)
- User Modeling and User-Adapted Interaction 6(2-3):157--184 (1996)
- IUI '07: Proceedings of the 12th international conference on Intelligent user interfaces, page 325--328. New York, NY, USA, ACM Press, (2007)
- (1996)
- (2006)
- (2006)
- CLIHC '05: Proceedings of the 2005 Latin American conference on Human-computer interaction, page 289--294. New York, NY, USA, ACM Press, (2005)
- WWW '06: Proceedings of the 15th international conference on World Wide Web, page 327--335. New York, NY, USA, ACM Press, (2006)
- Expert Systems with Applications 29(2):320--329 (August 2005)
- HT '07: Proceedings of the 18th conference on Hypertext and hypermedia, page 57--66. New York, NY, USA, ACM, (2007)
- User Modeling and User-Adapted Interaction 11(1 - 2):87--110 (March 2001)
- ITiCSE '08: Proceedings of the 13th annual conference on Innovation and technology in computer science education, page 22--26. New York, NY, USA, ACM, (2008)
- Proceedings of the IEEE 96(6):990--999 (2008)
- (2008)


user