G
[GS66] Seymour Ginsburg and Edwin Spanier. Semigroups, Presburger formulas, and languages. Pacific Journal of Mathematics 16(2):285-296. December 1966. 
@article{pjm16(2)-GS,
  author =              {Ginsburg, Seymour and Spanier, Edwin},
  title =               {Semigroups, {P}resburger formulas, and languages},
  journal =             {Pacific Journal of Mathematics},
  volume =              {16},
  number =              {2},
  pages =               {285-296},
  year =                {1966},
  month =               dec,
}
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