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 21 September 2024]. Available from: https://publications.waset.org/pdf/13866.