T. Tran, N. Tran, A. Hadgu, and R. Jäschke. Proceedings of the 2015 Conference on Empirical Methods in Natural Language Processing (EMNLP), page 97--106. Association for Computational Linguistics, (September 2015)
E. Yeh, D. Ramage, C. Manning, E. Agirre, and A. Soroa. Proceedings of the 2009 Workshop on Graph-based Methods for Natural Language Processing, page 41--49. Stroudsburg, PA, USA, Association for Computational Linguistics, (2009)