@incollection{Hayes87,
  author	= {Hayes, Philip J.},
  editor	= {du Boulay, B. and Hogg, D. and Steels, L.},
  year		= {1987},
  title		= {Steps towards Integrating Natural Language and Graphical Interaction for Knowledge-Based Systems},
  booktitle	= {Advances in Artificial Intelligence --- II},
  pages		= {543--552},
  note		= {(Proc. ECAI-86)},
  publisher	= {North-Holland},
  address	= {Amsterdam}
}