Pradana, Gregorius Signer, Budi Kamulyan, and Intan Supraba. “Effect of Sand Sphericity and Cement-to-Sand Ratio on Effective Porosity and Permeability of Concrete Sand Filter”. Inersia : Jurnal Teknik Sipil dan Arsitektur 20, no. 2 (December 31, 2024): 300–309. Accessed May 14, 2025. https://jurnal.uny.ac.id/index.php/inersia/article/view/76088.