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Research in Mathematics Education; Mathematical Challenges For All ,
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Making Mathematics Challenging Through Problem Posing in th..:
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Research in Mathematics Education; Research Studies on Learning and Teaching of Mathematics ,
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Mathematical Problem-Posing Research: Thirty Years of Advan..:
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Research in Mathematics Education; Doing Research: A New Researcher's Guide ,
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Crafting the Methods to Test Hypotheses:
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Initiationen mathematikdidaktischer Forschung ,
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