LUMBANTORUAN, Jitu Halomoan. Description of Difficulty of Semester VII Students of Mathematics Education Study Program in Complex Analysis Course. Journal of Education and Learning Mathematics Research (JELMaR), [S. l.], v. 3, n. 1, p. 1–13, 2022. DOI: 10.37303/jelmar.v3i1.103. Disponível em: https://jelmar.wisnuwardhana.ac.id/index.php/jelmar/article/view/103. Acesso em: 25 aug. 2026.