Khaled M. Alhawiti,  Role of Natural Language Processing in Information Retrieval; Challenges and Opportunities.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2014, vol. 96(12). 3940 - 3944
    [viewed 16 April 2024]. Available from: https://publications.waset.org/pdf/10000118.