S. Hassan, and R. Mihalcea. Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing: Volume 3-Volume 3, page 1192--1201. Association for Computational Linguistics, (2009)
P. Singer, T. Niebler, M. Strohmaier, and A. Hotho. Proceedings of the 22nd international conference on World Wide Web companion, page 171--172. Republic and Canton of Geneva, Switzerland, International World Wide Web Conferences Steering Committee, (2013)