@misc{cryptoeprint:2007:259,
    author = {Ziran Tu and Yingpu Deng},
    title = {Algebraic Immunity Hierarchy of Boolean Functions},
    howpublished = {Cryptology ePrint Archive, Report 2007/259},
    year = {2007},
    url = {http://eprint.iacr.org/2007/259},
}