Three theorems on phrase structure grammars of type~1. Landweber, P. S. Information and Control, 6:131--136, 6, 1963.
bibtex   
@article{Landweber1963,
  author = {Peter S. Landweber},
  title = {{Three theorems on phrase structure grammars of type~1}},
  journal = {Information and Control},
  volume =  {6},
  pages = {131--136},
  month = 6,
  year = 1963,
}

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