Cryptology ePrint Archive: BibTeX Citation of Report 2009/173

@misc{cryptoeprint:2009:173,
    author = {Patrick Longa and Catherine Gebotys},
    title = {Fast Multibase Methods and Other Several Optimizations for Elliptic Curve Scalar Multiplication},
    howpublished = {Cryptology ePrint Archive, Report 2009/173},
    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.