NURHIDAYAH, N.; WASKITONINGTYAS, R. S. Implementation of problem-based learning models to improve understanding of mathematics concepts at Al-Hassan high school. Jurnal Math Educator Nusantara: Wahana Publikasi Karya Tulis Ilmiah di Bidang Pendidikan Matematika, [S. l.], v. 9, n. 1, p. 76–88, 2023. DOI: 10.29407/jmen.v9i1.19544. Disponível em: https://ojs.unpkediri.ac.id/index.php/matematika/article/view/19544. Acesso em: 9 jan. 2025.