Cryptology ePrint Archive: BibTeX Citation of Report 2013/466

@misc{cryptoeprint:2013:466,
    author = {Amadou Tall and Ali Yassin Sanghare},
    title = {Efficient computation of  addition-subtraction chains using generalized continued Fractions},
    howpublished = {Cryptology ePrint Archive, Report 2013/466},
    year = {2013},
    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.