Irawan, Diki Surya, Muhammad Alham, Deffi Ayu Puspito Sari, and Dessy Fadiilah. 2025. “Optimizing Fly Ash and Cement Ratios for Immobilizing Lead and Arsenic in Liquid Hazardous Waste”. Engineering, Technology & Applied Science Research 15 (1). Greece:20500-507. https://doi.org/10.48084/etasr.9507.