@inproceedings{Heidorn75,
  author	= {Heidorn, G.},
  month		= jun,
  year		= {1975},
  title		= {Augmented phrase structure grammar},
  booktitle	= {Theoretical Issues in Natural Language Processing-1 (TINLAP)},
  pages		= {1--5},
  address	= {Cambridge, Mass.}
}