@misc{cryptoeprint:2010:155,
    author = {Zhang MeiLing, Liu JingMei, Wang XinMei},
    title = {the upper bounds on differntial characteristics in block cipher SMS4},
    howpublished = {Cryptology ePrint Archive, Report 2010/155},
    year = {2010},
    url = {http://eprint.iacr.org/2010/155},
}