Chantharathip, Kakanang, Pipat Sribenjalux, and Paradee Chuaybamroong. 2013. “Reduction of airborne bacteria in hospital using electronic air purifier with and without photocatalysis reactions”. Archives of Allied Health Sciences 25 (3). Khon Kaen, Thailand:236-45. https://he01.tci-thaijo.org/index.php/ams/article/view/66321.