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*  Reasoning in primary school? An analysis of 3rd grade German textbooks. In: Tso, T. Y. (ed.): Proceeding of the [[36th Conference of the International Group for the Psychology of Mathematics Education]]: Opportunities to Learn in Mathematics Education. Taipei (Taiwan) 2012, S. 267.  
 
*  Reasoning in primary school? An analysis of 3rd grade German textbooks. In: Tso, T. Y. (ed.): Proceeding of the [[36th Conference of the International Group for the Psychology of Mathematics Education]]: Opportunities to Learn in Mathematics Education. Taipei (Taiwan) 2012, S. 267.  
 
*  zusammen mit Meike Plath: Elementary school children solve spatial tasks: A variety of strategies. In: Tso, T-Y. (ed.): Proceedings of the 36th Conference of the International Group for the Psychology of Mathematics Education: Opportunities to Learn in Mathematics Education. Taipei (Taiwan) 2012, S. 305-312.  
 
*  zusammen mit Meike Plath: Elementary school children solve spatial tasks: A variety of strategies. In: Tso, T-Y. (ed.): Proceedings of the 36th Conference of the International Group for the Psychology of Mathematics Education: Opportunities to Learn in Mathematics Education. Taipei (Taiwan) 2012, S. 305-312.  
*  Understanding of capacity in 3rd grade. In: 12th International Congress on Mathematical Education (ICME-12) – TSG 8: Measurement. Seoul 2012 (Pre-Proceedings of the 12th International Congress on Mathematical Education: 8 July – 15 July, 2012, COEX, Seoul, Korea ICME (S. 1955-1963).   
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*  Understanding of capacity in 3rd grade. In: [[ICME-12|12th International Congress on Mathematical Education (ICME-12)]] – TSG 8: Measurement. Seoul 2012 (Pre-Proceedings of the 12th International Congress on Mathematical Education: 8 July – 15 July, 2012, COEX, Seoul, Korea ICME (S. 1955-1963).   
 
*  Vorstellungen über null und Null –  eine Fragebogenstudie. In: Beiträge zum Mathematikunterricht 2008:  Vorträge auf der 42. Tagung für Didaktik der Mathematik vom 13.3.2008  bis 18.3.2008 in Budapest. Münster: WTM, S. 677-680.
 
*  Vorstellungen über null und Null –  eine Fragebogenstudie. In: Beiträge zum Mathematikunterricht 2008:  Vorträge auf der 42. Tagung für Didaktik der Mathematik vom 13.3.2008  bis 18.3.2008 in Budapest. Münster: WTM, S. 677-680.
 
*  Metaphors  and Metonymies and their Impact in Mathematical Classroom  Discourses.  In: 10th International Congress on Mathematics Education  (ICME-10) –  TSG 25: “Language and Communication in Mathematics  Education.”  Distributed Paper Kopenhagen 2004, 10 Druckseiten.
 
*  Metaphors  and Metonymies and their Impact in Mathematical Classroom  Discourses.  In: 10th International Congress on Mathematics Education  (ICME-10) –  TSG 25: “Language and Communication in Mathematics  Education.”  Distributed Paper Kopenhagen 2004, 10 Druckseiten.