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Paul Cobb, Terry Wood, Erna Yackel, John Nicholls, Grayson Wheatley, Beatriz Trigatti, Marcella Perlwitz, Assessment of a Problem-Centered Second-Grade Mathematics Project, Journal for Research in Mathematics Education, Vol. 22, No. 1 (Jan., 1991), pp. 3-29
Cobb et al. (Tue,) studied this question.
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