@misc{cryptoeprint:2005:345,
    author = {Aggelos Kiayias and Moti Yung},
    title = {Group Signatures with Efficient Concurrent Join},
    howpublished = {Cryptology ePrint Archive, Report 2005/345},
    year = {2005},
    url = {http://eprint.iacr.org/2005/345},
}