@inproceedings{PulmanPassives,
  title = "Passives",
  author = "S. G. Pulman",
  year = "1987",
  booktitle = "Proceedings of the 3rd European Meeting of the Association for Computational Linguistics, Copenhagen: ACL",
  pages = "306--313",
  url = "http://acl.ldc.upenn.edu/E/E87/E87-1049.pdf",
}