@InProceedings{sudo-sekine-grishman:2003:ACL,
  author    = {Kiyoshi Sudo  and  Satoshi Sekine  and  Ralph Grishman},
  title     = {An Improved Extraction Pattern Representation Model for Automatic IE Pattern Acquisition},
  booktitle = {Proceedings of the 41st Annual Meeting of the Association for Computational Linguistics},
  month     = {July},
  year      = {2003},
  address   = {Sapporo, Japan},
  publisher = {Association for Computational Linguistics},
  pages     = {224--231},
  url       = {http://www.aclweb.org/anthology/P03-1029},
  doi       = {10.3115/1075096.1075125}
}