WASET
    Gang Liu and  Huimin Song and  Can Wang and  Runnan Zhang and  Lu Fang,  An Attribute Based Access Control Model with POL Module for Dynamically Granting and Revoking Authorizations.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2017, vol. 126(6). 758 - 764
    [viewed 16 April 2024]. Available from: https://publications.waset.org/pdf/10007354.