Extending formal language hierarchies to higher dimensions
ACM Computing Surveys (CSUR)
Dot-depth, monadic quantifier alternation, and first-order closure over grids and pictures
Theoretical Computer Science
The #a = #b Pictures Are Recognizable
STACS '01 Proceedings of the 18th Annual Symposium on Theoretical Aspects of Computer Science
Automata on Series-Parallel Biposets
DLT '01 Revised Papers from the 5th International Conference on Developments in Language Theory
Journal of Automata, Languages and Combinatorics
New operations and regular expressions for two-dimensional languages over one-letter alphabet
Theoretical Computer Science - The art of theory
Characterizations of recognizable picture series
Theoretical Computer Science
Picture Languages: From Wang Tiles to 2D Grammars
CAI '09 Proceedings of the 3rd International Conference on Algebraic Informatics
Regular expressions for two-dimensional languages over one-letter alphabet
DLT'04 Proceedings of the 8th international conference on Developments in Language Theory
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