@InProceedings{Erk_Niehren:2003,
      AUTHOR = {Erk, Katrin and Niehren, Joachim},
      TITLE = {Well-Nested Parallelism Constraints for Ellipsis Resolution},
      YEAR = {2003},
      BOOKTITLE = {Proceedings of EACL'03},
      ADDRESS = {Budapest},
      URL = {http://www.ps.uni-sb.de/Papers/abstracts/wellnested.html}
}