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Willard W. Hartup, Doran C. French, Brett Laursen, Mary Kathleen Johnston, John R. Ogawa, Conflict and Friendship Relations in Middle Childhood: Behavior in a Closed-Field Situation, Child Development, Vol. 64, No. 2 (Apr., 1993), pp. 445-454
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Hartup et al. (1993) studied this question.
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