@misc{cryptoeprint:2009:071,
    author = {Laszlo Csirmaz and Gabor Tardos},
    title = {Secret sharing on trees: problem solved},
    howpublished = {Cryptology ePrint Archive, Report 2009/071},
    year = {2009},
    url = {http://eprint.iacr.org/2009/071},
}