Cryptology ePrint Archive: BibTeX Citation of Report 2011/430

@misc{cryptoeprint:2011:430,
    author = {Dustin Moody and Daniel Shumow},
    title = {Analogues of Velu's Formulas for Isogenies on Alternate Models of Elliptic Curves},
    howpublished = {Cryptology ePrint Archive, Report 2011/430},
    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.