@inproceedings{Kozen:FOCS:1977,
    Address = {Washington, DC, USA},
    Author = {Kozen, Dexter},
    BookTitle = {Proc. of FOCS'77},
    File = {LowerBounds (0) - a - a - h.pdf},
    Pages = {254--266},
    Publisher = {IEEE Computer Society},
    Series = {SFCS '77},
    Title = {Lower Bounds for Natural Proof Systems},
    URL = {http://dx.doi.org/10.1109/SFCS.1977.16},
    Year = {1977},
    acmid = {1382559},
    bdsk-url-1 = {http://dx.doi.org/10.1109/SFCS.1977.16},
    date-added = {2017-12-06 08:16:02 +0000},
    date-modified = {2019-08-16 14:37:27 +0200},
    numpages = {13},
    doi = {10.1109/SFCS.1977.16}
}

@inproceedings{Kozen:FOCS:1977, Address = {Washington, DC, USA}, Author = {Kozen, Dexter}, BookTitle = {Proc. of FOCS'77}, File = {LowerBounds (0) - a - a - h.pdf}, Pages = {254--266}, Publisher = {IEEE Computer Society}, Series = {SFCS '77}, Title = {Lower Bounds for Natural Proof Systems}, URL = {http://dx.doi.org/10.1109/SFCS.1977.16}, Year = {1977}, acmid = {1382559}, bdsk-url-1 = {http://dx.doi.org/10.1109/SFCS.1977.16}, date-added = {2017-12-06 08:16:02 +0000}, date-modified = {2019-08-16 14:37:27 +0200}, numpages = {13}, doi = {10.1109/SFCS.1977.16} }