SIDIK, G. S. .; ZAHRAH, R. F. .; HARIYANI, M. .; FADHILATURRAHMI, F. Development of Mathematics Teaching Materials Using Didactical Design Research: A Study on Enhancing Pedagogical Content Knowledge in Quadratic Inequalities. Journal of Education For Sustainable Innovation , [S. l.], v. 1, n. 1, p. 39–48, 2023. DOI: 10.56916/jesi.v1i1.489. Disponível em: https://ejournal.papanda.org/index.php/jesi/article/view/489. Acesso em: 19 sep. 2025.