Tonapa, Suryanti Rapang, Desi Sandy, and Lisa Febriani. “EXPERIMENTAL STUDY OF POROUS CONCRETE WITH VARIOUS ADDITON OF RICE HUSK ASH”. IJRDO - Journal of Mechanical And Civil Engineering 3, no. 11 (November 30, 2017): 07-14. Accessed September 29, 2024. http://cpanel.ijrdo.org/index.php/mce/article/view/1461.