@misc{cryptoeprint:2007:309,
    author = {Subhamoy Maitra},
    title = {Balanced Boolean Function on 13-variables having Nonlinearity strictly greater than the Bent Concatenation Bound},
    howpublished = {Cryptology ePrint Archive, Report 2007/309},
    year = {2007},
    url = {http://eprint.iacr.org/2007/309},
}