Triman Rakasiwi, Dini Reka Azmaningtias, and Ismail M.H. 2021. “A Review: The Performance of Reinforced Concrete Beam Containing Palm Oil Fuel Ash and Metakaolin Subjected to Four-Point Bending Test”. Recent Trends in Civil Engineering and Built Environment 2 (1): 181-89. https://penerbit.uthm.edu.my/periodicals/index.php/rtcebe/article/view/1354.