S. Bethard, and D. Jurafsky. Proceedings of the 19th ACM international conference on Information and knowledge management, page 609--618. New York, NY, USA, ACM, (2010)
R. Stecher, C. Niederée, and W. Nejdl. Proceeding of the 17th ACM conference on Information and knowledge management, page 797--806. New York, NY, USA, ACM, (2008)