1. Weibelzahl, S.: Evaluation of adaptive systems. In Bauer, M., Gmytrasiewicz, P.J., Vassileva, J., eds.: User Modeling: Proceedings of the Eighth International Conference, UM2001. Springer, Berlin (2001) 292–294
2. Eklund, J.: A Study of Adaptive Link Annotation in Educational Hypermedia. PhD thesis, University of Sydney (1999)
3. Höök, K.: Steps to take before intelligent user interfaces become real. Interacting With Computers 12 (2000) 409–426
4. Brusilovsky, P.: Adaptive hypermedia. User Modeling and User-Adapted Interaction 11 (2001) 87–110
5. Oppermann, R., Rashev, R., Kinshuk: Adaptability and adaptivity in learning systems. In Behrooz, A., ed.: Knowledge Transfer. Volume II. (1997) 173–179