@misc{cryptoeprint:2004:027,
    author = {Joseph K. Liu and Victor K. Wei and Duncan S. Wong},
    title = {Linkable Spontaneous Anonymous Group Signature for Ad Hoc Groups},
    howpublished = {Cryptology ePrint Archive, Report 2004/027},
    year = {2004},
    url = {http://eprint.iacr.org/2004/027},
}