@misc{cryptoeprint:2009:604,
    author = {Eleanor Birrell and Salil Vadhan},
    title = {Composition of Zero-Knowledge Proofs with Efficient Provers},
    howpublished = {Cryptology ePrint Archive, Report 2009/604},
    year = {2009},
    url = {http://eprint.iacr.org/2009/604},
}