@misc{cryptoeprint:2006:021,
    author = {Denis Charles and Eyal Goren and Kristin Lauter},
    title = {Cryptographic hash functions from expander graphs},
    howpublished = {Cryptology ePrint Archive, Report 2006/021},
    year = {2006},
    url = {http://eprint.iacr.org/2006/021},
}