T. Zesch, und I. Gurevych. Proceedings of the TextGraphs-2 Workshop (NAACL-HLT), Seite 1--8. Rochester, Association for Computational Linguistics, (April 2007)
B. Yu, und M. Singh. Cooperative Information Agents IV - The Future of Information Agents in Cyberspace, Volume 1860 von Lecture Notes in Computer Science, Springer, Berlin/Heidelberg, (2000)