1. Day, R., Payne, L.: Computer managed instruction: An alternative teaching strategy. Journal of Nursing Education 26(1), 30–36 (1987)
2. Zaine, O.R.: Building a Recommender Agent for e-Learning Systems. In: Proceedings of International. Conference on Computers in Education, Auckland, New Zealand, December 3-6 , pp. 55–59 (2002)
3. Santos, O.C., Boticario, J.G.: Modelling recommendarions for lifelong learning. In: Proceedings of the workshop on RecommenderSystems and Personalized Retrieval at ICADIWT 2008 (in press, 2008)
4. Tang, T., McCalla, G.: Smart Recommendation for an Evolving E-Learning System. In: Workshop on Technologies for Electronic Documents for Supporting Learning, International Conference on Artificial Intelligence in Education (2003)
5. Drachsler, H., Hummel, H.G.K., Koper, R.: Personal RS for learners in lifelong learning: requirements, techniques and model. International Journal of Learning Technology (in press, 2007)