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Proceedings of the National Academy of Sciences of the United States of America|September 21, 2005
Abstract number and arithmetic in preschool childrenHilary Barth, Kristen La Mont, Jennifer Lipton, et al.
Cognition|May 7, 2005
Non-symbolic arithmetic in adults and young childrenHilary Barth, Kristen La Mont, Jennifer Lipton, et al.
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