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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.
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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.
* 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).
* 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).