- Communications of the ACM (June 2011)
- Communications of the ACM (June 2011)
- Communications of the ACM (June 2011)
- Communications of the ACM (August 2011)
- Using Ontology Databases for Scalable Query Answering, Inconsistency Detection, and Data IntegrationJournal of Intelligent Information Systems 37(2):217-244 (October 2011)
- Communications of the ACM 54(1):86–95 (January 2011)
- Lecture Notes in Business Information Processing Springer, Berlin, (2010)
- Pearson Addison-Wesley, Boston, MA, 8. edition, (2004)
- Communications of the ACM 53(1):72-77 (2010)
- Software \& Support, Frankfurt am Main, (2003)
- Lecture Notes in Business Information Processing Springer, Berlin, (2009)
- Communications of the ACM 51(7):52-58 (2008)
- ALPSWS2008: Proceedings of the 3rd International Workshop on Applications of Logic Programming to the Semantic Web and Web Services, Udine, Italy, (2008)
- dpunkt, Heidelberg, (2003)
- Hanser, München, 4. edition, (2009)
- Communications of the ACM 53(9):89-97 (2010)
- IT Professional 11(5):17--21 (2009)
- Oldenbourg, München, 7. edition, (2009)
- Wiley, Indianapolis, IN, (2004)
- Addison-Wesley, München, 3. edition, (2005)


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