@misc{cryptoeprint:2002:051,
    author = {Javier Herranz  and Germ\'an S\'aez},
    title = {Fully Distributed Proxy Signature Schemes},
    howpublished = {Cryptology ePrint Archive, Report 2002/051},
    year = {2002},
    url = {http://eprint.iacr.org/2002/051},
}