@misc{cryptoeprint:2009:463,
    author = {Benoit Gérard and Jean-Pierre Tillich},
    title = {On Linear Cryptanalysis with Many Linear Approximations},
    howpublished = {Cryptology ePrint Archive, Report 2009/463},
    year = {2009},
    url = {http://eprint.iacr.org/2009/463},
}