N. F. Ismail, “A Comparative Study of Double Layers Al2O3/Al2O3 and Al2O3/SiO2 Prepared by Microwave and Natural Drying”, ijie, vol. 4, no. 1, Sep. 2012, Accessed: Jul. 03, 2024. [Online]. Available: https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/129