H. Kwak, C. Lee, H. Park, and S. Moon. Proceedings of the 19th international conference on World wide web, page 591--600. New York, NY, USA, ACM, (2010)
W. Wu, B. Zhang, and M. Ostendorf. Human Language Technologies: The 2010 Annual Conference of the North American Chapter of the Association for Computational Linguistics, page 689--692. Stroudsburg, PA, USA, Association for Computational Linguistics, (2010)