HARKNESS, S. S.; NOBLITT, B. Pixels: Creating Lessons with Historical Connections Between Perimeter and Circumference. Ohio Journal of School Mathematics, [S. l.], v. 76, n. 2, 2017. Disponível em: https://www.osu.tests.sfulib4.publicknowledgeproject.org/index.php/OJSM/article/view/5831. Acesso em: 29 apr. 2026.