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Weibel, David; Wissmath, Bartholomäus; Habegger, Stephan; Steiner, Yves; Groner, Rudolf (2008). Playing online games against computer versus human-controlled opponents: Effects on presence, flow, and enjoyment. Computers in human behavior, 24(5), pp. 2274-2291. Amsterdam: Elsevier 10.1016/j.chb.2007.11.002
