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Journal of Educational Psychology
Journal of Educational Psychology
Editor: Panayiota Kendeou  
Supplemental Material for
The Early Development of Proportional Reasoning: A Longitudinal Study of 5- to 8-Year-Olds
Elien Vanluydt, Lieven Verschaffel, and Wim Van Dooren
Journal of Educational Psychology, Vol. 114, No. 6, pp. 1343–1358


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