@misc{cryptoeprint:2004:096,
    author = {Yi Mu and Fangguo Zhang and Willy Susilo},
    title = {On the Ambiguity of Concurrent Signatures},
    howpublished = {Cryptology ePrint Archive, Report 2004/096},
    year = {2004},
    url = {http://eprint.iacr.org/2004/096},
}