1. M. Hagiwara. Unnatural Language Processing Contest 2nd will be held at NLP2011 (2010). URL
http://bit.ly/dGvUnR
2. A. Ritter, S. Clark, Mausam, O. Etzioni, in Proceedings of the 2011 Conference on Empirical Methods in Natural Language Processing (ACL, Edinburgh, Scotland, UK., 2011), pp. 1524– 1534
3. S. Brody, N. Diakopoulos, in Proceedings of the 2011 Conference on Empirical Methods in Natural Language Processing (ACL, Edinburgh, Scotland, UK., 2011), pp. 562–570
4. C. Shannon, Bell System Technical Journal (27), 379 (1948)
5. D. Klein, J. Smarr, H. Nguyen, C. Manning, in Proceedings of the seventh conference on Natural language learning at HLT-NAACL 2003 - Volume 4 (Association for Computational Linguistics, Stroudsburg, PA, USA, 2003), CONLL ’03, pp. 180–183. DOI
10.3115/1119176
. 1119204