WASET
    Song Han and  Elizabeth Chang and  Jie Wang and  Wanquan Liu,  A New Proxy Signature Scheme As Secure As ElGamal Signature.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2007, vol. 11(11). 3525 - 3529
    [viewed 28 March 2024]. Available from: https://publications.waset.org/pdf/3873.