Cryptology ePrint Archive: BibTeX Citation of Report 2013/731

@misc{cryptoeprint:2013:731,
    author = {Yongqiang Li and Mingsheng Wang and Yuyin Yu},
    title = {Constructing Differentially 4-uniform Permutations over GF(2^{2k}) from the Inverse Function Revisited},
    howpublished = {Cryptology ePrint Archive, Report 2013/731},
    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.