Kurnia NE, Swastika A, Lestari S. Efforts to improve mathematical communication and collaboration skills through the Problem-Based Learning (PBL) model. J. Pend. Mat. Rafa [Internet]. 2024 Dec. 31 [cited 2025 Apr. 16];10(2):112-20. Available from: https://jurnal.radenfatah.ac.id/index.php/jpmrafa/article/view/22365