Karim, M., M. Zain, M. Jamil, and F. Lai. “An Experimental Study on Utilization of Slag and Fly Ash As an Alternative Cementitious Binder”. Journal of Asian Scientific Research, vol. 2, no. 11, Nov. 2012, pp. 620-5, https://archive.aessweb.com/index.php/5003/article/view/3404.