@inproceedings{Stein-thiel93,
  author	= {Stein, Adelheit and Thiel, Ulrich},
  year		= {1993},
  title		= {A Conversational Model of Multimodal Interaction in Information Systems},
  booktitle	= {Proceedings of the 11th National Conference on Artificial Intelligence (AAAI '93), Washington DC, USA},
  pages		= {283--288},
  publisher	= {AAAI Press/ MIT Press}
}