Crotta, Francesca, Miriam Salvisberg, and Giovanna Zanolla. “School Grades and Base Competencies in Mathematics of the 11th HarmoS Year Students in Ticino”. Swiss Journal of Educational Research 42, no. 2 (October 14, 2020): 323-342. Accessed October 26, 2020. https://sjer.ch/article/view/5520.