AMIR, F.; AMIR, M. F. Action Proof: Analyzing Elementary School Students Informal Proving Stages through Counter-examples. International Journal of Elementary Education, [S. l.], v. 5, n. 3, p. 401–408, 2021. DOI: 10.23887/ijee.v5i3.35089. Disponível em: https://ejournal.undiksha.ac.id/index.php/IJEE/article/view/35089. Acesso em: 28 apr. 2024.