1. Faculty of Education, Department of Linguistics, Science and Mathematics Education, Universitat de Barcelona (UB), Barcelona, Spain
2. Faculty for Mathematics and Physics, Gottfried Wilhelm Leibniz Universität Hannover (LUH), Hannover, Germany
3. Facultad de Ciencias Físico Matemáticas, Benemérita Universidad Autónoma de Puebla (BUAP), Puebla, México