J. Biehl, M. Czerwinski, G. Smith, und G. Robertson. CHI '07: Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, Seite 1313--1322. New York, NY, USA, ACM, (2007)
R. Navigli, K. Litkowski, und O. Hargraves. Proceedings of the Fourth International Workshop on Semantic Evaluations (SemEval-2007), Seite 30--35. Prague, Czech Republic, Association for Computational Linguistics, (Juni 2007)