K
[KM01] Jarkko Kari and Cristopher Moore. Rectangles and Squares Recognized by Two-dimensional Automata. In STACS'01, Lecture Notes in Computer Science 2010, pages 396-406. Springer-Verlag, February 2001. 
@inproceedings{stacs2001-KM,
  author =              {Kari, Jarkko and Moore, Cristopher},
  title =               {Rectangles and Squares Recognized by Two-dimensional
                         Automata},
  editor =              {Ferreira, Afonso and Reichel, Horst},
  booktitle =           {{P}roceedings of the 18th {S}ymposium on
                         {T}heoretical {A}spects of {C}omputer {S}cience
                         ({STACS}'01)},
  acronym =             {{STACS}'01},
  publisher =           {Springer-Verlag},
  series =              {Lecture Notes in Computer Science},
  volume =              {2010},
  pages =               {396-406},
  year =                {2001},
  month =               feb,
}
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