@article{Bernsen-etal96,
  author	= {Bernsen, N. O. and Dybkjaer, J. and Dybkjaer, L.},
  title		= {Cooperativity in human-machine and human-human spoken dialogue},
  journal	= {Discourse Processes},
  year		= {1996},
  volume	= {21},
  number	= {2},
  pages		= {213--236}
}