FAUZIAH, Nita Fatma. Cognitive System of Students in Solving Proportion Problems. Journal of Education and Learning Mathematics Research (JELMaR), [S. l.], v. 4, n. 1, p. 86–96, 2023. DOI: 10.37303/jelmar.v4i1.140. Disponível em: https://jelmar.wisnuwardhana.ac.id/index.php/jelmar/article/view/140. Acesso em: 25 aug. 2026.