@incollection{McCoyCheng91-catalina,
  author	= {McCoy, Kathleen F. and Cheng, Jeanette},
  editor	= {Paris, C{\'e}cile L. and Swartout, William R. and Mann, William C.},
  year		= {1991},
  title		= {Focus of attention: constraining what can be said next},
  booktitle	= {Natural language generation in artificial intelligence and compuational linguistics},
  publisher	= {Kluwer Academic Publishers}
}