@incollection{RothHefley93,
  author	= {Roth, S. and Hefley, W.},
  editor	= {Maybury, M.},
  year		= {1993},
  title		= {Intelligent multimedia presentation systems: research and principles},
  booktitle	= {Intelligent Multimedia Interfaces},
  pages		= {13--58},
  publisher	= {AAAI Press}
}