H. Kärkkäinen, J. Jussila, and J. Väisänen. Proceedings of the 14th International Academic MindTrek Conference: Envisioning Future Media Environments, page 228--236. New York, NY, USA, ACM, (2010)
J. Griesbaum. Generation International - die Zukunft von information, Wissenschaft und Profession. Proceedings der 31. Online Tagung der DGI, page 157-170. Frankfurt a.M., DGI, (2009)
E. Clemons, S. Barnett, and A. Appadurai. ICEC '07: Proceedings of the ninth international conference on Electronic commerce, page 267--276. New York, NY, USA, ACM, (2007)