@misc{cryptoeprint:2009:136,
    author = {Yvonne Cliff and Colin Boyd  and Juan Gonzalez Nieto},
    title = {How to Extract and Expand Randomness: A Summary and Explanation of Existing Results},
    howpublished = {Cryptology ePrint Archive, Report 2009/136},
    year = {2009},
    url = {http://eprint.iacr.org/2009/136},
}