Descriptional complexity of unambiguous input-driven pushdown automata

@article{Okhotin2015DescriptionalCO,
  title={Descriptional complexity of unambiguous input-driven pushdown automata},
  author={Alexander Okhotin and Kai Salomaa},
  journal={Theor. Comput. Sci.},
  year={2015},
  volume={566},
  pages={1-11}
}

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