The closure of Monadic NP (extended abstract)
STOC '98 Proceedings of the thirtieth annual ACM symposium on Theory of computing
Dot-depth, monadic quantifier alternation, and first-order closure over grids and pictures
Theoretical Computer Science
The monadic quantifier alternation hierarchy over grids and graphs
Information and Computation - Special issue: LICS'97
Tree-width and the monadic quantifier hierarchy
Theoretical Computer Science - Logic and complexity in computer science
Recognizable vs. regular picture languages
CAI'07 Proceedings of the 2nd international conference on Algebraic informatics
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