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### Co-authors

- Paul DrijversUtrecht UniversityVerified email at uu.nl
- Koeno GravemeijerProfessor emeritus, Eindhoven University of TechnologyVerified email at gravemeijer.nl
- Marja van den Heuvel-PanhuizenProfessor of Mathematics Education Utrecht UniversityVerified email at fi.uu.nl
- Ariyadi WijayaDepartment of Mathematics Education, Universitas Negeri Yogyakarta (Yogyakarta State UniversityVerified email at uny.ac.id
- monica wijersUtrecht UniversityVerified email at uu.nl
- Vincent Jonkerutrecht universityVerified email at uu.nl
- Janet AinleyProfessor of Education, University of LeicesterVerified email at le.ac.uk
- Carolyn KieranProfessor Emerita of mathematics education, Université du Québec à MontréalVerified email at uqam.ca
- Arthur BakkerAssociate Professor Mathematics Education, Utrecht UniversityVerified email at uu.nl
- Paul A. KirschnerEmeritus Professor (Educational Psychology), Open University of the NetherlandsVerified email at ou.nl