Malika Yaici and  Anis Oussayah and  Mohamed Ahmed Takerrabet,  Trust Management for an Authentication System in Ubiquitous Computing.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2018, vol. 138(6). 469 - 478
    [viewed 21 October 2019]. Available from: https://publications.waset.org/pdf/10009216.