@incollection{vonHahn-etal80,
  author	= {von Hahn, W. and Hoeppner, W. and Jameson, A. and Wahlster, W.},
  editor	= {Bolc, L.},
  year		= {1980},
  title		= {The Anatomy of the Natural Language Dialogue System HAM-RPM},
  booktitle	= {Natural Communication with Computers},
  publisher	= {Carl Hanser Verlag},
  address	= {M{\"u}nchen},
}