Cryptology ePrint Archive: BibTeX Citation of Report 2012/599

@misc{cryptoeprint:2012:599,
    author = {Min Yang, Qingshu Meng, Zhangyi Wang, Li Li, Huanguo Zhang},
    title = {On the coefficients of the polynomial in the number field sieve},
    howpublished = {Cryptology ePrint Archive, Report 2012/599},
    year = {2012},
    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.