@InProceedings{callisonburch:2008:EMNLP,
  author    = {Callison-Burch, Chris},
  title     = {Syntactic Constraints on Paraphrases Extracted from Parallel Corpora},
  booktitle = {Proceedings of the 2008 Conference on Empirical Methods in Natural Language Processing},
  month     = {October},
  year      = {2008},
  address   = {Honolulu, Hawaii},
  publisher = {Association for Computational Linguistics},
  pages     = {196--205},
  url       = {http://www.aclweb.org/anthology/D08-1021}
}