KAWAI Yosifumi: "An Analysis of the Structure of the Difficulty of 100 Simple Additions in Children" Bulletin of Tokyio Gakugei Univ.37. (1961)
KAWAI Yosifumi: "An Analysis of the Structure of the Difficulty of 100 Simple Additions in Children" Bulletin of Tokyio Gakugei Univ.37. (1961)
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河井洋文:《儿童100道简单加法难度结构分析》东京学艺大学通报第37期。
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