Cryptology ePrint Archive: BibTeX Citation of Report 2013/197

@misc{cryptoeprint:2013:197,
    author = {Razvan Barbulescu and Cyril Bouvier and Jérémie Detrey and Pierrick Gaudry and Hamza Jeljeli and Emmanuel Thomé and Marion Videau and Paul Zimmermann},
    title = {Discrete logarithm in GF(2^809) with FFS},
    howpublished = {Cryptology ePrint Archive, Report 2013/197},
    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.