Devi Oktaviana Latif, Ahmad Rifa’i, and Kabul Basah Suryolelono. “CHEMICAL CHARACTERISTICS OF VOLCANIC ASH IN INDONESIA FOR SOIL STABILIZATION: MORPHOLOGY AND MINERAL CONTENT”. GEOMATE Journal, vol. 11, no. 26, Oct. 2019, pp. 2606-10, https://geomatejournal.com/geomate/article/view/2646.