G
[GR97] Dora Giammarresi et Antonio Restivo. Two-dimensional Languages. In Grzegorz Rozenberg et Arto Salomaa (eds.), Handbook of Formal Languages. Springer-Verlag, 1997. 
@incollection{HFL1997(3)-GR,
  author =              {Giammarresi, Dora and Restivo, Antonio},
  title =               {Two-dimensional Languages},
  editor =              {Rozenberg, Grzegorz and Salomaa, Arto},
  booktitle =           {Handbook of Formal Languages},
  publisher =           {Springer-Verlag},
  volume =              {3},
  pages =               {215-267},
  year =                {1997},
}
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