WASET
    Salim Istyaq,  Hybrid Authentication System Using QR Code with OTP.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2016, vol. 114(6). 1250 - 1253
    [viewed 10 May 2024]. Available from: https://publications.waset.org/pdf/10005654.