Parochial altruism in humans

The genetical evolution of social behaviour. I

W D Hamilton · Journal of Theoretical Biology · 1964 · 15.9K citations

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Social categorization and intergroup behaviour

Henri Tajfel, M. G. Billig, R. P. Bundy et al. · European Journal of Social Psychology · 1971 · 5.5K citations

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In-group bias in the minimal intergroup situation: A cognitive-motivational analysis.

Marilynn B. Brewer · Psychological Bulletin · 1979 · 3.4K citations

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Evolution of indirect reciprocity by image scoring

Martin A. Nowak, Karl Sigmund · Nature · 1998 · 2.7K citations

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