Sangchay, Weerachai, and Kornkanok Ubolchollakhat. 2016. “Photocatalytic and Antibacterial Activities of ZnO Powders Prepared via a Sol-Gel Method”. Engineering and Applied Science Research 43 (1):21-25. https://ph01.tci-thaijo.org/index.php/easr/article/view/35409.