@incollection{Ballmer81,
  author	= {Ballmer, T. T.},
  editor	= {Parret, H. and Sbisa, M. and Verscheuren, J},
  year		= {1981},
  title		= {Context change and its consequences for a theory of natural language},
  booktitle	= {Possibilities and Limitations of Pragmatics},
  note		= {Conference on Pragmatics, Urbino, July8-14, 1979},
  publisher	= {John Benjamins B.V.},
  address	= {Amsterdam},
  pages		= {17--56}
}