@misc{cryptoeprint:2009:038,
    author = {Bhupendra Singh and Lexy Alexander and Sanjay Burman},
    title = {On Algebraic Relations of Serpent S-Boxes},
    howpublished = {Cryptology ePrint Archive, Report 2009/038},
    year = {2009},
    url = {http://eprint.iacr.org/2009/038},
}