SYAMSURI, Syamsuri; PURWANTO, Purwanto; SUBANJI, Subanji; IRAWATI, Santi. Using APOS Theory Framework: Why Did Students Unable To Construct a Formal Proof?. International Journal on Emerging Mathematics Education, [S. l.], v. 1, n. 2, p. 135–146, 2017. DOI: 10.12928/ijeme.v1i2.5659. Disponível em: https://journal.uad.ac.id/index.php/IJEME/article/view/5659. Acesso em: 4 nov. 2024.