WASET
    Masao Okabe,  Ontology-Navigated Tutoring System for Flipped-Mastery Model.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2016, vol. 119(11). 3616 - 3622
    [viewed 28 March 2024]. Available from: https://publications.waset.org/pdf/10005731.