R. Reichart, and A. Rappoport. Proceedings of the Thirteenth Conference on Computational Natural Language Learning, page 156--164. Stroudsburg, PA, USA, Association for Computational Linguistics, (2009)
V. Spitkovsky, H. Alshawi, A. Chang, and D. Jurafsky. Proceedings of the Conference on Empirical Methods in Natural Language Processing, page 1281--1290. Stroudsburg, PA, USA, Association for Computational Linguistics, (2011)