WASET
    Jebari Chaker and  Ounalli Habib,  The Usefulness of Logical Structure in Flexible Document Categorization.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2007, vol. 12(12). 4120 - 4123
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/4230.