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Constructing validity in classroom conversations
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In: CERME9 - Ninth Congress of the European Society for Research in Mathematics Education ; https://hal.archives-ouvertes.fr/hal-01280563 ; CERME9 - Ninth Congress of the European Society for Research in Mathematics Education , Charles University in Prague, Faculty of Education; ERME, Feb 2015, Prague, Czech Republic. pp.128-134 (2015)
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