1. Adomavicius, G. and Tuzhilin, A. 2005. Toward the next generation of recommender systems: A survey of the state-of-the-art and possible extensions. IEEE Transactions on Knowledge & Data Engineering, 6, 734--749.
2. Buder, J. and Schwind, C. 2012. Learning with personalized recommender systems: A psychological view. Computers in Human Behavior, 28, 1, 207--216.
3. Challam, V., Gauch, S., and Chandramouli, A. 2007. Contextual search using ontology-based user profiles. In Large Scale Semantic Access to Content (Text, Image, Video, and Sound), (May.2007), 612--617.
4. Ciloglugil, B., and Inceoglu, M. M. 2018. A Learner Ontology Based on Learning Style Models for Adaptive E-Learning. In International Conference on Computational Science and Its Applications (May.2018), Springer, Cham. 199--212.
5. Ciloglugil, B. and Inceoglu, M.M. 2016. Ontology usage in e-learning systems focusing on metadata modeling of learning objects. In International Conference on New Trends in Education, ICNTE, 80--96.