U. Riss, and O. Grebner. Proceedings of I-KNOW '06, 6th International Conference on Knowledge Management, Graz, Austria, September 6 - 8, 2006, (September 2006)
E. Ong, O. Grebner, and U. Riss. 4th Conference on Professional Knowledge Management - Experiences and Visions -, March 28. - 30. 2007, Potsdam, Germany, GITO Verlag Berlin, (March 2007)