WASET
    Ke Lu and  Tetsuya Furukawa,  Analyzing Methods of the Relation between Concepts based on a Concept Hierarchy.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2011, vol. 53(5). 481 - 486
    [viewed 28 March 2024]. Available from: https://publications.waset.org/pdf/2602.