F. Suchanek, M. Sozio, und G. Weikum. WWW '09: Proceedings of the 18th international conference on World wide web, Seite 631--640. New York, NY, USA, ACM, (2009)
D. Fisher, A. Brush, E. Gleave, und M. Smith. CSCW '06: Proceedings of the 2006 20th anniversary conference on Computer supported cooperative work, Seite 309--312. New York, NY, USA, ACM, (2006)