@article{Gradel:1988:SPA:46416.46419,
    Address = {Essex, UK},
    Author = {Gr\"{a}del, Erich},
    File = {1-s2.0-0304397588901363-main (0) - a - a - i.pdf},
    ISSN = {0304-3975},
    Journal = {Theor. Comput. Sci.},
    Month = {March},
    Number = {3},
    Pages = {289--301},
    Publisher = {Elsevier Science Publishers Ltd.},
    Title = {Subclasses of Presburger Arithmetic and the Polynomial-time Hierarchy},
    URL = {http://dx.doi.org/10.1016/0304-3975(88)90136-3},
    Volume = {56},
    Year = {1988},
    acmid = {46419},
    bdsk-url-1 = {http://dx.doi.org/10.1016/0304-3975(88)90136-3},
    date-added = {2018-09-16 15:32:26 +0000},
    date-modified = {2018-09-16 15:32:26 +0000},
    issue_date = {March, 1988},
    numpages = {13},
    doi = {10.1016/0304-3975(88)90136-3}
}

@article{Gradel:1988:SPA:46416.46419, Address = {Essex, UK}, Author = {Gr\"{a}del, Erich}, File = {1-s2.0-0304397588901363-main (0) - a - a - i.pdf}, ISSN = {0304-3975}, Journal = {Theor. Comput. Sci.}, Month = {March}, Number = {3}, Pages = {289--301}, Publisher = {Elsevier Science Publishers Ltd.}, Title = {Subclasses of Presburger Arithmetic and the Polynomial-time Hierarchy}, URL = {http://dx.doi.org/10.1016/0304-3975(88)90136-3}, Volume = {56}, Year = {1988}, acmid = {46419}, bdsk-url-1 = {http://dx.doi.org/10.1016/0304-3975(88)90136-3}, date-added = {2018-09-16 15:32:26 +0000}, date-modified = {2018-09-16 15:32:26 +0000}, issue_date = {March, 1988}, numpages = {13}, doi = {10.1016/0304-3975(88)90136-3} }