On context-free rewriting with a simple restriction and its computational completeness

@article{Masopust2009OnCR,
  title={On context-free rewriting with a simple restriction and its computational completeness},
  author={Tomas Masopust and Alexander Meduna},
  journal={RAIRO Theor. Informatics Appl.},
  year={2009},
  volume={43},
  pages={365-378}
}
This paper discusses context-free rewriting systems in which there exist two disjoint finite sets of rules, and a symbol, referred to as a condition of applicability, is attached to each rule in either of these two sets. In one set, a rule with a symbol attached to it is applicable if the attached symbol occurs in the current rewritten string while in the other set, such a rule is applicable if the attached symbol does not occur there. The present paper demonstrates that these rewriting systems… 

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