- 2nd World Summit on the Knowledge Society WSKS 2009, Crete, Greece, 2009, 49, page 15-25. Springer, (2009)
- volume 5333 of Lecture Notes in Compter Science, Springer, (2008)
- Good Tags and Bad Tags - Social Tagging in der Wissensorganisation, volume 47 of Medien in der Wissenschaft, Waxmann, (2008)
- 1st International Workshop on Learning in Enterprise 2.0 and Beyond, volume 383 of CEUR Workshop Proceedings, (2008)
- Workshop Nutzerinteraktion im Social Semantic Web, Mensch & Computer - 8. Fachuebergreifende Konferenz - M&C 2008 Sept. 8-9, 2008, Lübeck, Germany, (2008)
- International Workshop on Emergent Semantics and Ontology Evolution ESOE, ISWC 2007, Busan/Korea, (2007)
- 4th Conference Professional Knowledge Management - Experiences and Visions WM '07, Potsdam, 1, page 325-334. Berlin, GITO, (2007)
- 4th Conference Professional Knowledge Management - Experiences and Visions WM '07, Potsdam, Workshop on Learning Software Organizations LSO 07, 2, page 155-164. Berlin, GITO, (2007)
- 4th Conference on Professional Knowledge Management - Experiences and Visions, Workshop on Productive Knowledge Work ProKW 07, 2, page 217-226. Berlin, GITO, (Mar 28, 2007)


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