@article{WEISCHEDEL80,
  author	= {Weischedel, R. M. and Black, J. E.},
  year		= {1980},
  title		= {Responding Intelligently to Unparsable Inputs},
  journal	= {American Journal of Computational Linguistics},
  volume	= {6},
  number	= {2},
  pages		= {97--109}
}