@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},
    url = {http://eprint.iacr.org/2011/033},
}