S. Dori-Hacohen, and J. Allan. Proceedings of the 22nd ACM international conference on Conference on information &\#38; knowledge management, page 1845--1848. New York, NY, USA, ACM, (2013)
D. Jurafsky, and J. Martin. Prentice Hall series in artificial intelligence Prentice Hall, Pearson Education International, London u.a., 2. ed., Pearson International Edition edition, (2009)
J. Nothman, T. Murphy, and J. Curran. EACL '09: Proceedings of the 12th Conference of the European Chapter of the Association for Computational Linguistics, page 612--620. Morristown, NJ, USA, Association for Computational Linguistics, (2009)