1. Aroyo, L., Dicheva, D.: Aims: Learning and teaching support for www-based education. Int. Journal for Continuing Engineering Education and Life-long Learning (IJCEELL) 11, 152–164 (2001)
2. Berners-Lee, T., Hendler, J., Lassila, O.: The semantic web, pp. 35–43. Scientific American (2001)
3. Bra, P.D., Aroyo, L., Chepegin, V.: The next big thing: Adaptive web-based systems. Journal of Digital Information 5(1) (2004)
4. Brusilovsky, P., Eklund, J.: A study of user model based link annotation in educational hypermedia. Journal of Universal Computer Science 4(4), 429–448 (1998)
5. Denaux, R.: Ontology-based interactive user modeling for adaptive information systems. Master’s thesis, Technische Universiteit Eindhoven (2005)