Submitted on: 11 October 2023.
Revised on: 04 December 2023.
Accepted on: 28 December 2023.
___________________Journal fur Mathematik-Didaktik
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Submitted on: 24 November 2018.
Revised on: 09 March 2019.
Accepted on: 16 April 2019.
___________________Journal fur Mathematik-Didaktik
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Submitted on: 14 July 2021.
Revised on: 07 September 2021.
Accepted on: 13 October 2021.
___________________Journal fur Mathematik-Didaktik