@incollection{Davies88-possibilities,
  author	= {Davies, Eirian},
  editor	= {Cummings, Michael J. and Greaves, William S. and Benson, James D.},
  year		= {1988},
  title		= {On different possibilities in the syntax of English},
  booktitle	= {Linguistics in a systemic perspective},
  publisher	= {Benjamins},
  address	= {Amsterdam}
}