A. Dong, Y. Chang, S. Ji, C. Liao, X. Li, and Z. Zheng. EMNLP '09: Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing, page 1086--1095. Morristown, NJ, USA, Association for Computational Linguistics, (2009)
J. Xu, C. Chen, G. Xu, H. Li, and E. Abib. WSDM '10: Proceedings of the third ACM international conference on Web search and data mining, page 171--180. New York, NY, USA, ACM, (2010)