user- Proceedings of nineteenth Annual Workshop on Information Technologies and Systems WITS 2009, Phoenix, Arizona, USA, (2009)
- UCSC-CRL-07-09. School of Engineering, University of California, Santa Cruz, CA, USA, (2007)
- UCSC-SOE-08-09. School of Engineering, University of California, Santa Cruz, CA, USA, (2008)
- UCSC-SOE-08-08. School of Engineering, University of California, Santa Cruz, CA, USA, (2008)
- Proceedings of the International Conference on Information Quality, page 442--454. (2005)
- 12th International Conference on Information Quality ICIQ-2007, M.I.T., (2007)Universität Regensburg .
- Nature (2005)
- New York University, New York, NY, (May 2008)
- Kommunikation@ gesellschaft (2007)Wikis - Diskurse, Theorien und Anwendungen .
- Proceedings of the 2007 international symposium on Wikis (2007)
- The Social Semantic Web 2007 - Proceedings of the 1st Conference on Social Semantic Web, Bonn, Universit\ät Leipzig, Germany, Gesellschaft f\ür Informatik, (2007)
- Vdm Verlag Dr. Müller, (October 2007)
- Kommunikation@gesellschaft (2007)
