Cryptology ePrint Archive: BibTeX Citation of Report 2009/471

@misc{cryptoeprint:2009:471,
    author = {Ryuichi Harasawa and Yutaka Sueyoshi and Aichi Kudo and Liang Cui},
    title = {Improving the Berlekamp algorithm for binomials \boldmath$x^{n} - a$},
    howpublished = {Cryptology ePrint Archive, Report 2009/471},
    year = {2009},
    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.