Sari, E. A. ., K. . Hadiprasetyo, and A. A. . Wulandari. “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, vol. 7, no. 1, May 2021, pp. 1-11, doi:10.29407/jmen.v7i1.14766.