Castellini, A., and A. L. Fazzino. “Star polygons. And Beyond. Path to a Vertical Curriculum in the First Cycle of Education”. EDiMaST: Experiences of Teaching With Mathematics, Sciences and Technology, vol. 3, no. 3, July 2018, pp. 527-38, https://www.edimast.it/index.php/edimast/article/view/55.