@incollection{Fawcett89-flex,
  author	= {Fawcett, Robin P. and Taylor, M. M.},
  editor	= {Neel, F. and Boushuis, D. G. and Taylor, M. M.},
  year		= {1989},
  title		= {A discourse grammar that allows flexibility},
  booktitle	= {The structure of multi-modal dialogue},
  publisher	= {North-Holland},
  address	= {Amsterdam}
}