WASET
    Nhon Do and Tuyen Trong Tran and  Phan Hoai Truong,  Design Method for Knowledge Base Systems in Education Using COKB-ONT.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2008, vol. 24(12). 4047 - 4053
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/13866.