., F.; UMAR, K. .; PASARIBU, F. .; NOVITASARI, W. .; SOFYAN SAMOSIR, B. .; ., Y. Analysis of Difficulty Understanding Student Mathematica by Using Online Learning Model. KnE Social Sciences, [S. l.], v. 8, n. 4, p. 180–188, 2023. DOI: 10.18502/kss.v8i4.12898. Disponível em: https://knepublishing.com/index.php/KnE-Social/article/view/12898. Acesso em: 13 may. 2025.