@article{Gaifman:1993:UOP:174130.174142,
    Address = {New York, NY, USA},
    Author = {Gaifman, Haim and Mairson, Harry and Sagiv, Yehoshua and Vardi, Moshe Y.},
    File = {Undecidable optimization problems for database logic programs - Gaifman, Mairson, Sagiv, Vardi (0) (0) - a - a - c.pdf},
    ISSN = {0004-5411},
    Journal = {J. ACM},
    Month = {July},
    Number = {3},
    Pages = {683--713},
    Publisher = {ACM},
    Title = {Undecidable optimization problems for database logic programs},
    URL = {http://doi.acm.org/10.1145/174130.174142},
    Volume = {40},
    Year = {1993},
    acmid = {174142},
    bdsk-url-1 = {http://doi.acm.org/10.1145/174130.174142},
    bdsk-url-2 = {http://dx.doi.org/10.1145/174130.174142},
    date-added = {2013-01-02 12:30:04 +0000},
    date-modified = {2013-01-02 16:13:25 +0000},
    issue_date = {July 1993},
    numpages = {31},
    doi = {10.1145/174130.174142}
}

@article{Gaifman:1993:UOP:174130.174142, Address = {New York, NY, USA}, Author = {Gaifman, Haim and Mairson, Harry and Sagiv, Yehoshua and Vardi, Moshe Y.}, File = {Undecidable optimization problems for database logic programs - Gaifman, Mairson, Sagiv, Vardi (0) (0) - a - a - c.pdf}, ISSN = {0004-5411}, Journal = {J. ACM}, Month = {July}, Number = {3}, Pages = {683--713}, Publisher = {ACM}, Title = {Undecidable optimization problems for database logic programs}, URL = {http://doi.acm.org/10.1145/174130.174142}, Volume = {40}, Year = {1993}, acmid = {174142}, bdsk-url-1 = {http://doi.acm.org/10.1145/174130.174142}, bdsk-url-2 = {http://dx.doi.org/10.1145/174130.174142}, date-added = {2013-01-02 12:30:04 +0000}, date-modified = {2013-01-02 16:13:25 +0000}, issue_date = {July 1993}, numpages = {31}, doi = {10.1145/174130.174142} }