@misc{cryptoeprint:2006:193,
    author = {Victor K. Wei and Tsz Hon Yuen},
    title = {(Hierarchical Identity-Based) Threshold Ring Signatures},
    howpublished = {Cryptology ePrint Archive, Report 2006/193},
    year = {2006},
    url = {http://eprint.iacr.org/2006/193},
}