Brunelli, F., and F. Chesi. “Unpaired Socks in a Dark Room. Probability Calculation Materials for Teachers in Primary and Secondary Schools”. EDiMaST: Experiences of Teaching With Mathematics, Sciences and Technology, vol. 3, no. 2, June 2018, p. 11, https://www.edimast.it/index.php/edimast/article/view/52.