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* Leo Rogers, Roehampton University, Digby Stuart College, Roehampton University, UK
 
* Leo Rogers, Roehampton University, Digby Stuart College, Roehampton University, UK
 
* David Pengelley, New Mexico State University, Las Cruces, USA
 
* David Pengelley, New Mexico State University, Las Cruces, USA
* Gert Schubring, Institut fur Didaktik der Mathematik, Universitat Bielefeld, Germany
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* [[Gert Schubring]], Institut fur Didaktik der Mathematik, Universitat Bielefeld, Germany
 
* Man Keung Siu, Department of Mathematics, University of Hong Kong, China
 
* Man Keung Siu, Department of Mathematics, University of Hong Kong, China
 
* Bjørn Smestad, Faculty of Education, Oslo University College, Norway  
 
* Bjørn Smestad, Faculty of Education, Oslo University College, Norway