Prasetia, I., D. R. Wicakso, M. A. Ma’ruf, and W. A. Krasna. “Assessment of Kalimantan Coal Ash Properties and Potential As Sustainable Construction Material”. Engineering, Technology & Applied Science Research, vol. 14, no. 6, Dec. 2024, pp. 18488-94, doi:10.48084/etasr.8972.