Cryptology ePrint Archive: BibTeX Citation of Report 2012/464

@misc{cryptoeprint:2012:464,
    author = {Carles Padro and Leonor Vazquez and  An Yang},
    title = {Finding Lower Bounds on the Complexity of Secret Sharing Schemes by Linear Programming},
    howpublished = {Cryptology ePrint Archive, Report 2012/464},
    year = {2012},
    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.