Cryptology ePrint Archive: BibTeX Citation of Report 2011/153

@misc{cryptoeprint:2011:153,
    author = {Jingguo Bi and Qi Cheng},
    title = {Lower bounds  of  shortest vector lengths in random knapsack lattices and random NTRU lattices},
    howpublished = {Cryptology ePrint Archive, Report 2011/153},
    year = {2011},
    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.