“UTILIZATION OF ULTRAFINE PALM OIL FUEL ASH IN INTERLOCKING COMPRESSED EARTH BRICK”, INTERNATIONAL JOURNAL OF GEOMATE, vol. 21, no. 87, pp. 70–78, Nov. 2021, Accessed: Apr. 18, 2026. [Online]. Available: https://geomatejournal.com/geomate/article/view/1669