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Order and equivalence of rational numbers: a cognitive analysis
Post, Thomas R. ; Wachsmuth, Ipke ; Lesh, Richard ; Behr, Merlyn J.
In: Journal for research in mathematics education, Jg. 16 H. 1, S. 18-36
Order and equivalence of rational numbers: a clinical teaching experiment
Behr, Merlyn J. ; Wachsmuth, Ipke ; Post, Thomas R. ; Lesh, Richard
In: Journal for research in mathematics education, Jg. 15 H. 5, S. 323-341

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