@misc{cryptoeprint:2005:290,
    author = {Jens Groth and Rafail Ostrovsky and Amit Sahai},
    title = {Perfect Non-Interactive Zero Knowledge for NP},
    howpublished = {Cryptology ePrint Archive, Report 2005/290},
    year = {2005},
    url = {http://eprint.iacr.org/2005/290},
}