J. Leitner, and M. Haller. Proceedings of the 24th annual ACM symposium on User interface software and technology, page 593--602. New York, NY, USA, ACM, (2011)event-place: Santa Barbara, California, USA.
A. Nenkova, and R. Passonneau. Proceedings of the Human Language Technology Conference of the North American Chapter of the Association for Computational Linguistics: HLT-NAACL 2004, page 145--152. Boston, Massachusetts, USA, Association for Computational Linguistics, (2004)