@article{VanEmden:1976:SPL:321978.321991,
    Address = {New York, NY, USA},
    Author = {Van Emden, M. H. and Kowalski, R. A.},
    ISSN = {0004-5411},
    Journal = {J. ACM},
    Month = {October},
    Number = {4},
    Pages = {733--742},
    Publisher = {ACM},
    Title = {The Semantics of Predicate Logic as a Programming Language},
    URL = {http://doi.acm.org/10.1145/321978.321991},
    Volume = {23},
    Year = {1976},
    acmid = {321991},
    bdsk-url-1 = {http://doi.acm.org/10.1145/321978.321991},
    bdsk-url-2 = {http://dx.doi.org/10.1145/321978.321991},
    date-added = {2013-04-18 19:10:52 +0000},
    date-modified = {2013-04-18 19:10:52 +0000},
    issue_date = {Oct. 1976},
    numpages = {10},
    doi = {10.1145/321978.321991}
}

@article{VanEmden:1976:SPL:321978.321991, Address = {New York, NY, USA}, Author = {Van Emden, M. H. and Kowalski, R. A.}, ISSN = {0004-5411}, Journal = {J. ACM}, Month = {October}, Number = {4}, Pages = {733--742}, Publisher = {ACM}, Title = {The Semantics of Predicate Logic as a Programming Language}, URL = {http://doi.acm.org/10.1145/321978.321991}, Volume = {23}, Year = {1976}, acmid = {321991}, bdsk-url-1 = {http://doi.acm.org/10.1145/321978.321991}, bdsk-url-2 = {http://dx.doi.org/10.1145/321978.321991}, date-added = {2013-04-18 19:10:52 +0000}, date-modified = {2013-04-18 19:10:52 +0000}, issue_date = {Oct. 1976}, numpages = {10}, doi = {10.1145/321978.321991} }