John Tarus and Zhendong Niu and Bakhti Khadidja, E-Learning Recommender System Based on Collaborative Filtering and Ontology. journal = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology. January 2017, vol. 122(2). 256 - 261 [viewed 23 September 2024]. Available from: https://publications.waset.org/pdf/10006531.