O. Arazy, and O. Nov. CSCW '10: Proceedings of the 2010 ACM conference on Computer supported cooperative work, page 233--236. New York, NY, USA, ACM, (2010)
F. Aschoff, V. Schaer, and G. Schwabe. Proceedings of the 5th International Conference on Communities and Technologies, page 69--78. New York, NY, USA, ACM, (2011)