Ryohei Maruyama: "Children's Constructing Concepts of Number-conservation over Three Years at a Kindergarten"Bulletin of Joetsu University of Education. 23-1. 11-22 (2003)
Ryohei Maruyama: "Children's Constructing Concepts of Number-conservation over Three Years at a Kindergarten"Bulletin of Joetsu University of Education. 23-1. 11-22 (2003)
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丸山良平:《幼儿园三年内儿童数守恒概念的建构》上越教育大学通报。
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