- Technical Report, 663. Institute for Pervasive Computing, ETH Zurich, (February 2010)
- IT Professional 8(2):18-24 (2006)
- University of California, Irvine, Doctoral dissertation, (2000)
- ACM Transactions on Internet Technology 2(2):115-150 (2002)
- dpunkt, Heidelberg, (2009)
- Web Semantics 6(1):61-69 (2008)
- Communications of the ACM 51(10):43-49 (2008)
- Hanser, München, 3. edition, (2008)
- O'Reilly, Beijing, (2007)
- O'Reilly, Beijing, (2010)


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