@incollection{Tucker92,
  author	= {Tucker, Gordon H.},
  editor	= {Davies, Martin and Ravelli, Louise},
  year		= {1992},
  title		= {An initial approach to comparatives in a systemic functional grammar},
  booktitle	= {Advances in systemic linguistics: recent theory and practice},
  publisher	= {Pinter},
  address	= {London},
  pages		= {150--167}
}