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Löber, Andreas; Schwabe, Gerhard; Grimm, Sibylle (2007). Audio vs. chat: The effects of group size on media choice. In: 40. HICCS Hawaii International Conference on System Sciences, Waikoloa, 1 January 2007 - 1 January 2007.
Löber, Andreas; Grimm, Sibylle; Schwabe, Gerhard (2006). Audio vs chat: Can media speed explain the differences in productivity? In: 14th European Conference on Information Systems, ECIS 2006, Göteborg, 12 June 2006 - 14 June 2006.