@incollection{PattenRitchie87,
  author	= {Patten, Terry and Ritchie, Graeme},
  editor	= {Kempen, Gerard},
  year		= {1987},
  title		= {A formal model of Systemic Grammar},
  booktitle	= {Natural Language Generation: Recent Advances in Artificial Intelligence, Psychology, and Linguistics},
  note		= {Paper presented at the Third International Workshop on Natural Language Generation, August 1986, Nijmegen, The Netherlands},
  publisher	= {Kluwer Academic Publishers},
  address	= {Boston/Dordrecht}
}