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| | Noelting, G. (1980). The development of proportional reasoning and the ratio concept. Part II: Problem structure at successive stages: Problem-solving strategies and the mechanism of adaptive restructuring. ''Educational Studies in Mathematics'', 11(4), 331–363. | | Noelting, G. (1980). The development of proportional reasoning and the ratio concept. Part II: Problem structure at successive stages: Problem-solving strategies and the mechanism of adaptive restructuring. ''Educational Studies in Mathematics'', 11(4), 331–363. |
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| − | Karplus, R., Pulos, S., & Stage, E. (1983). Proportional reasoning of early adolescents. In R. Lesh & M. Landau (Eds.), ''Acquisition of mathematical concepts and processes'' (pp. 45–89). New York, NY: Academic Press. | + | Karplus, R., Pulos, S., & Stage, E. (1983). Proportional reasoning of early adolescents. En R. Lesh & M. Landau (Eds.), ''Acquisition of mathematical concepts and processes'' (pp. 45–89). New York, NY: Academic Press. |
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