@misc{cryptoeprint:2005:170,
    author = {Ivan Damg{\aa}rd and Kasper Dupont and Michael {\O}stergaard Pedersen},
    title = {Unclonable Group Identification},
    howpublished = {Cryptology ePrint Archive, Report 2005/170},
    year = {2005},
    url = {http://eprint.iacr.org/2005/170},
}