Hmway Hmway Tar and  Thi Thi Soe Nyaunt,  Ontology-based Concept Weighting for Text Documents.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2011, vol. 57(9). 991 - 995
    [viewed 07 December 2019]. Available from: https://publications.waset.org/pdf/631.