IBRAHIM, Ali Huddin. Influence of Coal Bottom Ash on Properties of Portland cement Mortar. International Journal of Integrated Engineering, [S. l.], v. 11, n. 2, 2019. Disponível em: https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/4240. Acesso em: 7 apr. 2026.