Aziz, Abdul, and Iswahyudi Joko Suprayitno. “Misunderstanding and Writing Signs in Mathematical Proof”. Proceeding Education, Science, and Technology International Conference  2, no. 1 (August 24, 2024): 252–254. Accessed September 28, 2024. http://103.97.100.158/index.php/edusciencetech/article/view/584.