Cryptology ePrint Archive: BibTeX Citation of Report 2012/007

@misc{cryptoeprint:2012:007,
    author = {Qiang Li, Xiangxue Li, Dong Zheng, Kefei Chen},
    title = {Optimal Multiple Assignments with (m,m)-Scheme for General Access Structures},
    howpublished = {Cryptology ePrint Archive, Report 2012/007},
    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.