Erik Aarts
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1995
Acyclic Context-sensitive Grammars
Erik Aarts
Proceedings of the Fourth International Workshop on Parsing Technologies
A grammar formalism is introduced that generates parse trees with crossing branches. The uniform recognition problem is NP-complete, but for any fixed grammar the recognition problem is polynomial.
1992
Uniform Recognition for Acyclic Context-Sensitive Grammars is NP-complete
Erik Aarts
COLING 1992 Volume 4: The 14th International Conference on Computational Linguistics