Yahya AA, Ali N, Abdul Samad AA, Mohd Kamal NL, Shahidan S, Abdullah SR. Mortar Containing Coal Bottom Ash (CBA) Treated with Citric Acid as Partial Cement Replacement. IJIE. 2024;16(9):118-129. Accessed April 7, 2026. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/19564