@InProceedings{johnson:2002:ACL,
  author    = {Mark Johnson},
  title     = {A Simple Pattern-matching Algorithm for Recovering Empty Nodes and their Antecedents},
  booktitle = {Proceedings of 40th Annual Meeting of the Association for Computational Linguistics},
  month     = {July},
  year      = {2002},
  address   = {Philadelphia, Pennsylvania, USA},
  publisher = {Association for Computational Linguistics},
  pages     = {136--143},
  url       = {http://www.aclweb.org/anthology/P02-1018},
  doi       = {10.3115/1073083.1073107}
}