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"New operations and regular expressions for two-dimensional languages over ..."
Marcella Anselmo, Dora Giammarresi, Maria Madonia (2005)
- Marcella Anselmo, Dora Giammarresi, Maria Madonia:
New operations and regular expressions for two-dimensional languages over one-letter alphabet. Theor. Comput. Sci. 340(1): 408-431 (2005)
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