Cryptology ePrint Archive: BibTeX Citation of Report 2013/582

@misc{cryptoeprint:2013:582,
    author = {Antoine Joux and Cécile Pierrot},
    title = {The Special Number Field Sieve in $\F _{p^{n}}$, Application to Pairing-Friendly Constructions},
    howpublished = {Cryptology ePrint Archive, Report 2013/582},
    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.