S. Riedel, L. Yao, and A. McCallum. Proceedings of the 2010 European conference on Machine learning and knowledge discovery in databases: Part III, page 148--163. Berlin, Heidelberg, Springer-Verlag, (2010)
X. Li, B. Liu, and S. Ng. Proceedings of the 2010 Conference on Empirical Methods in Natural Language Processing, page 218--228. Stroudsburg, PA, USA, Association for Computational Linguistics, (2010)