Cryptology ePrint Archive: BibTeX Citation of Report 2011/555

@misc{cryptoeprint:2011:555,
    author = {Michelle Kendall and Keith Martin},
    title = {On the Role of Expander Graphs in Key Predistribution Schemes for Wireless Sensor Networks},
    howpublished = {Cryptology ePrint Archive, Report 2011/555},
    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.