Ratnua, Tasanaporn, Pratchayaporn Yukhajon, Tammanoon Chankhanittha, and Poonsuk Poosimma. “The Study of Microstructure and Electrical Property of Aluminium doped ZnO-based Varistor Materials”. KKU Science Journal 48, no. 4 (December 28, 2020): 554–562. accessed April 16, 2025. https://ph01.tci-thaijo.org/index.php/KKUSciJ/article/view/250217.