@misc{cryptoeprint:2005:178,
    author = {Zhou Sujing and  Lin Dongdai},
    title = {Analyzing Unlinkability of Some Group Signatures},
    howpublished = {Cryptology ePrint Archive, Report 2005/178},
    year = {2005},
    url = {http://eprint.iacr.org/2005/178},
}