Dhaffah, Vallieskha Nurmanita, Septiani Yugni Maudy, and Mulia Putra. 2026. “Learning Obstacles in Understanding Pyramid Volume: An Epistemological and Didactical Analysis Within the Didactical Design Research Framework”. Jurnal Didactical Mathematics 8 (2):345-70. https://doi.org/10.31949/dm.v8i2.18713.