1. The IRIS shell: How to build ITSs from Pedagogical and design requisites;Arruarte;International Journal of Artificial Intelligence in Education,1997
2. Attewell, J. (2005). From research and development to mobile learning: tools for education and training providers and their learners. , retrieved October 9, 2009.
3. Attewell, J. (2009). Mobile technologies and learning: A technology update and mlearning project summary. London: Learning and skills development agency. , retrieved October 9, 2009.
4. Web-based education for all: A tool for developing adaptive courseware;Brusilovsky;Computer Networks and ISDN Systems,1998
5. Hybrid recommender systems: Survey and experiments;Burke;User Modeling and User Adapted Interactions,2002