The bystander-effect: A meta-analytic review on bystander intervention in dangerous and non-dangerous emergencies.

Fischer, Peter, Krueger, Joachim I., Greitemeyer, Tobias, Vogrincic, Claudia, Kastenmüller, Andreas, Frey, Dieter, Heene, Moritz, Wicher, Magdalena +1 more·2011·Psychological Bulletin

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