Cryptology ePrint Archive: BibTeX Citation of Report 2013/147

@misc{cryptoeprint:2013:147,
    author = {Naomi Benger  and Manuel Charlemagne and Kefei Chen},
    title = {A note on the practical complexity of the NFS in the medium prime case: Smoothness of Norms },
    howpublished = {Cryptology ePrint Archive, Report 2013/147},
    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.