Cryptology ePrint Archive: BibTeX Citation of Report 2010/401

@misc{cryptoeprint:2010:401,
    author = {Jan Camenisch and Thomas Groß and Peter Hladky and Christian Hoertnagl},
    title = {Privacy-friendly Incentives and their Application to Wikipedia (Extended Version)},
    howpublished = {Cryptology ePrint Archive, Report 2010/401},
    year = {2010},
    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.