Oh Lai Ching, N., Sia, C. K., Yee, S. K., Ong, P., Zainudin, A., Muhd Nor, N. H., & Hassan, M. F. (2018). Taguchi design and flower pollination algorithm application to optimize the EMI shielding of plaster mortar containing palm oil fuel ash. International Journal of Integrated Engineering, 10(3). https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/2109