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ORCID"Normal Forms for Contextual Grammars."
Andrzej Ehrenfeucht, Gheorghe Paun, Grzegorz Rozenberg (1994)
- Andrzej Ehrenfeucht, Gheorghe Paun, Grzegorz Rozenberg:
Normal Forms for Contextual Grammars. Mathematical Aspects of Natural and Formal Languages 1994: 79-95
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