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Stephen W. Worchel, Frankie Y. Wong, Karen E. Scheltema, Improving Intergroup Relations: Comparative Effects of Anticipated Cooperation and Helping on Attraction for an Aid-Giver, Social Psychology Quarterly, Vol. 52, No. 3 (Sep., 1989), pp. 213-219
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Worchel et al. (1989) studied this question.
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