A. A. Umoh and K. O. Olusola, “Compressive Strength and Static Modulus of Elasticity of Periwinkle Shell Ash Blended Cement Concrete”, ijscet, vol. 3, no. 2, pp. 45–55, Dec. 2012, Accessed: May 03, 2024. [Online]. Available: https://publisher.uthm.edu.my/ojs/index.php/IJSCET/article/view/441