F. Raja and  M. Rahgozar and  F. Oroumchian,  Using Dempster-Shafer Theory in XML Information Retrieval.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2008, vol. 20(8). 2714 - 2717
    [viewed 22 April 2021]. Available from: https://publications.waset.org/pdf/14416.