Faraji Sepideh,  Providing a Secure Hybrid Method for Graphical Password Authentication to Prevent Shoulder Surfing, Smudge and Brute Force Attack.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2019, vol. 156(12). 616 - 620
    [viewed 20 February 2020]. Available from: https://publications.waset.org/pdf/10010958.