@incollection{vanHahn80,
  author	= {van Hahn, W. and Hoeppner, W. and Jamewon, A. and Walster, W.},
  editor	= {Bolc, L.},
  year		= {1980},
  title		= {The Anatomy of the Natural Language Dialogue System HAM-RPM},
  booktitle	= {Natural Language based Computer Systems},
  publisher	= {Hanser/Macmillan},
  address	= {Munich}
}