ANDREAS P PERANGINANGIN. The Application of Problem-Based Learning Model to Improve Students’ Mathematical Problem-Solving Skills in Junior High School. Jurnal Info Sains : Informatika dan Sains, [S. l.], v. 15, n. 01, p. 140–150, 2025. Disponível em: https://ejournal.seaninstitute.or.id/index.php/InfoSains/article/view/7057. Acesso em: 14 sep. 2026.