Cryptology ePrint Archive: BibTeX Citation of Report 2013/519

@misc{cryptoeprint:2013:519,
    author = {Joppe W. Bos and Peter L. Montgomery and Daniel Shumow and Gregory M. Zaverucha},
    title = {Montgomery Multiplication Using Vector Instructions},
    howpublished = {Cryptology ePrint Archive, Report 2013/519},
    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.