Cryptology ePrint Archive: BibTeX Citation of Report 2011/568

@misc{cryptoeprint:2011:568,
    author = {Aleksander Essex and Christian Henrich and Urs Hengartner},
    title = {Single Layer Optical-scan Voting with Fully Distributed Trust},
    howpublished = {Cryptology ePrint Archive, Report 2011/568},
    year = {2011},
    note = {\url{http://eprint.iacr.org/}},
}

You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.