@misc{cryptoeprint:2003:020,
    author = {Bernhard L\"ohlein},
    title = {Attacks based on Conditional Correlations against the Nonlinear Filter Generator},
    howpublished = {Cryptology ePrint Archive, Report 2003/020},
    year = {2003},
    url = {http://eprint.iacr.org/2003/020},
}