Cryptology ePrint Archive: BibTeX Citation of Report 2011/033

@misc{cryptoeprint:2011:033,
    author = {Jean-Marc Couveignes and Jean-Gabriel Kammerer},
    title = {The Geometry of Flex Tangents to a  Cubic Curve and   its Parameterizations},
    howpublished = {Cryptology ePrint Archive, Report 2011/033},
    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.