Penelope J. Oakes, S. Alexander Haslam, Brenda Morrison, Diana Grace, Becoming an In-Group: Reexamining the Impact of Familiarity on Perceptions of Group Homogeneity, Social Psychology Quarterly, Vol. 58, No. 1 (Mar., 1995), pp. 52-60
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Oakes et al. (1995) studied this question.
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