1. Automatic content extraction (ACE) evaluation. http://www.itl. nist.gov/iad/mig/tests/ace/.
2. BioCreAtIvE. http://www.biocreative.org/.
3. Eugene Agichtein and Luis Gravano. Snowball: Extracting relations from large plain-text collections. In Proceedings of the 5th ACM Conference on Digital Libraries, pages 85–94, 2000.
4. Douglas E. Appelt, Jerry R. Hobbs, John Bear, David Israel, and Mabry Tyson. FASTUS: A finite-state processor for information extraction from real-world text. In Proceedings of the 13th International Joint Conference on Artificial Intelligence, 1993.
5. Andrew Arnold, Ramesh Nallapati, and William W. Cohen. Exploiting feature hierarchy for transfer learning in named entity recognition. In Proceedings of the 46th Annual Meeting of the Association for Computational Linguistics, pages 245–253, 2008.