@misc{cryptoeprint:2013:022,
    author = {James McLaughlin and John A. Clark},
    title = {Nonlinear cryptanalysis of reduced-round Serpent and metaheuristic search for S-box approximations.},
    howpublished = {Cryptology ePrint Archive, Report 2013/022},
    year = {2013},
    url = {http://eprint.iacr.org/2013/022},
}