[DG08] Volker Diekert and Paul Gastin. First-order definable languages. In Jörg Flum, Erich Grädel, and Thomas Wilke (eds.), Logic and Automata: History and Perspectives, Texts in Logic and Games 2, pages 261-306. Amsterdam University Press, 2008.
  author =              {Diekert, Volker and Gastin, Paul},
  title =               {First-order definable languages},
  editor =              {Flum, J{\"o}rg and Gr{\"a}del, Erich and Wilke,
  booktitle =           {Logic and Automata: History and Perspectives},
  publisher =           {Amsterdam University Press},
  series =              {Texts in Logic and Games},
  volume =              {2},
  pages =               {261-306},
  year =                {2008},
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