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Masaki Yuki, Intergroup Comparison versus Intragroup Relationships: A Cross-Cultural Examination of Social Identity Theory in North American and East Asian Cultural Contexts, Social Psychology Quarterly, Vol. 66, No. 2, Special Issue: Social Identity: Sociological and Social Psychological Perspectives (Jun., 2003), pp. 166-183
Masaki Yuki (Sun,) studied this question.