Liora Linchevski, Bilha Kutscher, Tell Me with Whom You're Learning, and I'll Tell You How Much You've Learned: Mixed-Ability versus Same-Ability Grouping in Mathematics, Journal for Research in Mathematics Education, Vol. 29, No. 5 (Nov., 1998), pp. 533-554
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Linchevski et al. (1998) studied this question.
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