@article{Allerton78,
  author	= {Allerton, D. J.},
  year		= {1978},
  title		= {The Notion of `Givenness' and its Relations to Presupposition and to Theme},
  journal	= {Lingua},
  pages		= {133--168},
  volume	= {44},
  number	= {2/3}
}