1. Fensel, D., Hendler, J.A., Lieberman, H., Wahlster, W. (eds.): Spinning the Semantic Web: Bringing the World Wide Web to Its Full Potential. MIT Press, Boston (2003)
2. Lecture Notes in Artificial Intelligence;W. Wahlster,2003
3. Wahlster, W. (ed.): SmartKom: Foundations of Multimodal Dialogue Systems. Springer, Heidelberg (2004)