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- 01/01/2015
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- 01/01/2007
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- 01/01/2012
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- 01/01/2011
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- 01/01/2016
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- 01/01/2007
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- 01/01/2013
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- Gesellschaft für Didaktik der Mathematik
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- 01/01/2008
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- 01/01/2005
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