I
[IT91] Katsushi Inoue and Itsuo Takanami. A survey of two-dimensional automata theory. Information Science 55(1-3):99-121. June 1991. 
@article{is55(1-3)-IT,
  author =              {Inoue, Katsushi and Takanami, Itsuo},
  title =               {A survey of two-dimensional automata theory},
  journal =             {Information Science},
  volume =              {55},
  number =              {1-3},
  pages =               {99-121},
  year =                {1991},
  month =               jun,
}
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