T.Fujii & M.Stephens: "Creating abridge between early algebra and arithmetic through quasi-variable expressions"Proceedings of Mathematics Education for a Knowledge-Based Era. 2. 78-86 (2002)
T.Fujii & M.Stephens: "Creating abridge between early algebra and arithmetic through quasi-variable expressions"Proceedings of Mathematics Education for a Knowledge-Based Era. 2. 78-86 (2002)
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