@article{Hunt:JACM:1982,
    Address = {New York, NY, USA},
    Author = {Hunt, III, H. B.},
    File = {On the Decidability of Grammar Problems - Hunt (0) (0) - a - a - i.pdf},
    ISSN = {0004-5411},
    Journal = {J. ACM},
    Month = {April},
    Number = {2},
    Pages = {429--447},
    Publisher = {ACM},
    Title = {On the Decidability of Grammar Problems},
    URL = {http://doi.acm.org/10.1145/322307.322317},
    Volume = {29},
    Year = {1982},
    acmid = {322317},
    bdsk-url-1 = {http://doi.acm.org/10.1145/322307.322317},
    bdsk-url-2 = {http://dx.doi.org/10.1145/322307.322317},
    date-added = {2016-01-13 12:01:27 +0000},
    date-modified = {2016-01-29 12:09:20 +0000},
    issue_date = {April 1982},
    numpages = {19},
    doi = {10.1145/322307.322317}
}

@article{Hunt:JACM:1982, Address = {New York, NY, USA}, Author = {Hunt, III, H. B.}, File = {On the Decidability of Grammar Problems - Hunt (0) (0) - a - a - i.pdf}, ISSN = {0004-5411}, Journal = {J. ACM}, Month = {April}, Number = {2}, Pages = {429--447}, Publisher = {ACM}, Title = {On the Decidability of Grammar Problems}, URL = {http://doi.acm.org/10.1145/322307.322317}, Volume = {29}, Year = {1982}, acmid = {322317}, bdsk-url-1 = {http://doi.acm.org/10.1145/322307.322317}, bdsk-url-2 = {http://dx.doi.org/10.1145/322307.322317}, date-added = {2016-01-13 12:01:27 +0000}, date-modified = {2016-01-29 12:09:20 +0000}, issue_date = {April 1982}, numpages = {19}, doi = {10.1145/322307.322317} }