[1]
Siahaan, Y.H. et al. 2026. Implementation of Problem-Based Learning Model to Improve Mathematical Problem-Solving Skills of Grade XI-2 Students of SMAN 19 Pekanbaru. Jurnal Didactical Mathematics . 8, 1 (Apr. 2026), 204–222. DOI:https://doi.org/10.31949/dm.v8i1.17437.