@incollection{Ehrich87,
  author	= {Ehrich, V.},
  editor	= {Kempen, G.},
  title		= {The Generation of Tense},
  booktitle	= {Natural Language Generation: New Results in Artificial Intelligence, Psychology and Linguistics},
  publisher	= {Martinus Nijhoff Pbs},
  address	= {dordrecht},
  year		= {1987}
}