1. College of Liberal Arts and Science, Alfred University, Alfred, USA
2. Technology & Pedagogy, Faculty of Education, Ontario Tech University, Oshawa, Canada
3. Department of Mathematics Education, Simon Fraser University, Burnaby, Canada
4. Department of Mathematics “Giuseppe Peano”, University of Torino, Torino, Italy
5. Applied Physics Laboratory, The Johns Hopkins University, Baltimore, USA
6. Department of Mathematics and Computer Science, University of Catania, Catania, Italy