By Gravemeijer K.   Doorman M.   in Educational Studies in Mathematics

ISSN:0013-1954|39|1|111-129

Springer Publishing Company ‎(1999)‎

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By Gravemeijer K.   Terwel J.   in Journal of Curriculum Studies

ISSN:1366-5839|32|6|777-796

Routledge Ltd‎(2000)‎

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By Dolk M.   den Hertog J.   Gravemeijer K.   in International Journal of Educational Research

ISSN:0883-0355|37|2|161-178

Elsevier‎(2002)‎

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