Sari, Ervina Anvita, Krisdianto Hadiprasetyo, and Andhika Ayu Wulandari. 2021. “Learning Difficulties of Mathematic Students on Real Analysis Courses With an Online System”. Jurnal Math Educator Nusantara: Wahana Publikasi Karya Tulis Ilmiah Di Bidang Pendidikan Matematika 7 (1):1-11. https://doi.org/10.29407/jmen.v7i1.14766.