Wan Ibrahim, Mohd Haziman, Sajjad Ali Mangi, Mohd Baharudin Ridzuan, Burhanudin M.K, Norwati Jamaluddin, Kok Hui Li, Shahiron Shahidan, Faisal Sheikh Khalid, Mohd Fadzil Arshad, and Ramadhansyah Putra Jaya. “Compressive and Flexural Strength of Concrete Containing Palm Oil Biomass Clinker With Hooked-End Steel Fibers”. International Journal of Integrated Engineering 10, no. 9 (January 1, 2019). Accessed June 1, 2020. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/2559.