P. Kelley, M. Benisch, L. Cranor, and N. Sadeh. Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, page 2449--2452. New York, NY, USA, ACM, (2011)
K. Strater, and H. Lipford. Proceedings of the 22nd British HCI Group Annual Conference on People and Computers: Culture, Creativity, Interaction - Volume 1, page 111--119. Swinton, UK, UK, British Computer Society, (2008)
S. Pötzsch, P. Wolkerstorfer, and C. Graf. Proceedings of the 6th Nordic Conference on Human-Computer Interaction: Extending Boundaries, page 363--372. New York, NY, USA, ACM, (2010)
J. Heesen, and M. Neubauer. Beiträge zur Informatik 2008 Beherrschbare Systeme - 38. Jahrestagung der Gesellschaft für Informatik e.V. (GI) im 'Workshop Digitale Soziale Netze', page 2.916--2.922. (September 2008)