SIMBOLON, Novi Tari; NABABAN, Imelda; SAGALA, Agnes Fransisca. The Implementation of Problem-Based Learning Model to Improve Junior High School Students’ Mathematical Problem-Solving Ability. Outline Journal of Education, [S. l.], v. 5, n. 2, p. 73–81, 2026. DOI: 10.61730/dzxdzv95. Disponível em: https://journal.outlinepublisher.com/index.php/OJE/article/view/719. Acesso em: 18 aug. 2026.