2 IZA Discussion Papers
IZA Discussion Paper No. 11944
revised version published as "Nastiness in groups" in: Journal of the European Economic Association, 22 (5): 2075–2107
IZA Discussion Paper No. 5189
revised version published as 'Competition Between Organizational Groups: Its Impact on Altruistic and Anti-Social Motivations' in: Management Science, 2012, 58 (5), 948-960