Ariyani, Dewi, and Heru Agni Setiaji. “Effectiveness of The Problem-Based Learning Model Assisted With Ruangguru Application on Increasing Students’ Mathematical Problem Solving Ability”. International Journal of Research in Mathematics Education, vol. 2, no. 1, July 2024, pp. 15-26, doi:10.24090/ijrme.v2i1.8948.