Yarman, Yarman, Yerizon Yerizon, Fitrani Dwina, Dewi Murni, and Kelly Angelly Hevardani. “Analysis of Concept Construction and Student Errors on the Topic of Double Integral Based on APOS Theory”. Jurnal Pendidikan Matematika 18, no. 3 (September 2, 2024): 367–386. Accessed October 5, 2024. https://jpm.ejournal.unsri.ac.id/index.php/jpm/article/view/91.