@misc{cryptoeprint:2002:144,
    author = {A.M. Youssef and S.E. Tavares},
    title = {On Some Algebraic Structures in the AES Round Function},
    howpublished = {Cryptology ePrint Archive, Report 2002/144},
    year = {2002},
    url = {http://eprint.iacr.org/2002/144},
}