@misc{cryptoeprint:2009:223,
    author = {Tao Xie and Dengguo Feng},
    title = {How To Find Weak Input Differences For MD5 Collision Attacks},
    howpublished = {Cryptology ePrint Archive, Report 2009/223},
    year = {2009},
    url = {http://eprint.iacr.org/2009/223},
}