Ismail, N. F. (2012) “A Comparative Study of Double Layers Al2O3/Al2O3 and Al2O3/SiO2 Prepared by Microwave and Natural Drying”, International Journal of Integrated Engineering, 4(1). Available at: https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/129 (Accessed: 4 July 2022).