- IEEE Intelligent Systems 24(6):83-89 (2009)
- Lecture Notes in Computer Science Springer, Berlin, (2011)
- Lecture Notes in Computer Science Springer, Berlin, (2011)
- Spektrum, Heidelberg, (2012)
- Informatik-Spektrum 34(5):434-442 (October 2011)
- Informatik-Spektrum 34(5):462-468 (October 2011)
- Informatik-Spektrum 34(5):443-454 (October 2011)
- Informatik-Spektrum 34(3):255-264 (June 2011)
- Artificial Intelligence Review 35(4):339-368 (April 2011)
- Journal of Intelligent Information Systems 36(2):131-166 (April 2011)
- Using Ontology Databases for Scalable Query Answering, Inconsistency Detection, and Data IntegrationJournal of Intelligent Information Systems 37(2):217-244 (October 2011)
- Journal of Intelligent Information Systems 36(2):167-195 (April 2011)
- User Modeling and User-Adapted Interaction 21(3):285-331 (August 2011)
- Springer, Berlin, (2011)
- IUI '07: Proceedings of the 11th International Conference on Intelligent User Interfaces, Honolulu, Hawaii, USA, page 180-189. (2007)
- IEEE Intelligent Systems 25(4):62-71 (2010)
- Communications of the ACM 53(12):80–90 (December 2010)
- Communications of the ACM 53(10):95-103 (2010)
- IEEE Internet Computing 14(6):39-46 (2010)
- Artificial Intelligence Review 35(1):37-51 (January 2010)


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