@misc{cryptoeprint:2004:206,
    author = {Jing Xu  and  Zhenfeng Zhang  and  Dengguo Feng},
    title = {ID-Based Proxy Signature Using Bilinear Pairings},
    howpublished = {Cryptology ePrint Archive, Report 2004/206},
    year = {2004},
    url = {http://eprint.iacr.org/2004/206},
}