WIDJAJA, W.; VALE, C. Counterexamples: Challenges faced by elementary students when testing a conjecture about the relationship between perimeter and area. Journal on Mathematics Education, [S. l.], v. 12, n. 3, p. 487–506, 2021. Disponível em: https://jme.ejournal.unsri.ac.id/index.php/jme/article/view/3648. Acesso em: 1 jul. 2025.