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"Ingroup Love" and "Outgroup Hate" as Motives for Individual Participation in Intergroup Conflict: A New Game Paradigm
Halevy, Nir, (2007)
Trust between individuals and groups: Groups are less trusting than individuals but just as trustworthy
Bornstein, Gary,
Reciprocity and emotions : arousal, self-reports, and expectations
Ben-Shakhar, Gershon, (2004)