M. Mokhtar, N. A. F. Abdul Halim, N. H. Mahmod, and N. N. Mohd Rashdan, “Use of Rice Husk and Coconut Shell Ash in Concrete Production”, MARI, vol. 3, no. 2, pp. 205–213, Jul. 2022, Accessed: Jul. 18, 2024. [Online]. Available: https://penerbit.uthm.edu.my/periodicals/index.php/mari/article/view/4067