M. Foth, J. jeong Choi, и C. Satchell. Proceedings of the ACM 2011 conference on Computer supported cooperative work, стр. 1--8. New York, NY, USA, ACM, (2011)
D. Vyas, S. de Groot, и G. van der Veer. Proceedings of the 13th Eurpoean conference on Cognitive ergonomics: trust and control in complex socio-technical systems, стр. 119--120. New York, NY, USA, ACM, (2006)
M. Khan. University of Kassel, Fachbereich 16: Elektrotechnik/Informatik, Distributed Systems Group, Wilhelmshöher Allee 73, 34121 Kassel, Germany, (марта 2010)