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=== Konferenzbeiträge ===
=== Konferenzbeiträge ===
* (mit Marleen Heid und Dana Farina Weiher) Measurement estimation in primary school: Which answer is adequate? In: Beswick, K.., Muir, T., & Wells, J. (eds.). Proceedings of 39th Psychology of Mathematics Education conference, Vol. 4, pp. 113-120. Hobart (Australia) PME 2015
* (mit Marleen Heid und Dana Farina Weiher) Measurement estimation in primary school: Which answer is adequate? In: Beswick, K.., Muir, T., & Wells, J. (eds.). Proceedings of [[39th Conference of the International Group for the Psychology of Mathematics Education|39th Psychology of Mathematics Education]] conference, Vol. 4, pp. 113-120. Hobart (Australia) PME 2015
* (mit Inga Niedermeyer) The influence of symmetric objects on spatial perspective-taking – An interview-study with young elementary school children. InIn C.Nicol, S. Oesterle, P. Liljedahl & D. Allan (eds.), Proceedings of the Joint Meeting of PME 38 and PME-NA 36, Vol. 4, pp. 305-312. Vancouver, Canada: PME.
* (mit [[Inga Niedermeyer]]) The influence of symmetric objects on spatial perspective-taking – An interview-study with young elementary school children. InIn C.Nicol, S. Oesterle, P. Liljedahl & D. Allan (eds.), Proceedings of the Joint Meeting of [[PME 38]] and PME-NA 36, Vol. 4, pp. 305-312. Vancouver, Canada: PME.
* (mit Astrid Neumann) Written reasoning in primary school. In C.Nicol, S. Oesterle, P. Liljedahl & D. Allan (eds.), Proceedings of the Joint Meeting of PME 38 and PME-NA 36, Vol. 5, pp. 73-80. Vancouver, Canada: PME 2014.
* (mit Astrid Neumann) Written reasoning in primary school. In C.Nicol, S. Oesterle, P. Liljedahl & D. Allan (eds.), Proceedings of the Joint Meeting of PME 38 and PME-NA 36, Vol. 5, pp. 73-80. Vancouver, Canada: PME 2014.
* 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. Vol. 4, p 267. Taipei (Taiwan) PME 2012.
* 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. Vol. 4, p 267. Taipei (Taiwan) PME 2012.
=== Beiträge in Sammelbänden ===
=== Beiträge in Sammelbänden ===