Triman Rakasiwi, D. R. A., & 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), 181-189. https://publisher.uthm.edu.my/periodicals/index.php/rtcebe/article/view/1354