The bystander-effect: a meta-analytic review on bystander intervention in dangerous and non-dangerous emergencies
Psychological Bulletin (2011) - Comment
pubmed: 21534650  doi: 10.1037/a0023304  issn: 1939-1455  issn: 0033-2909 

Peter Fischer, Joachim I. Krueger, Tobias Greitemeyer, Claudia Vogrincic, Andreas Kastenmüller, Dieter Frey, Moritz Heene, Magdalena Wicher, Martina Kainbacher