Chanchai, Withaya. 2024. “Evaluation of the Physical Performance of Chemical Indicators in the Sterilization Process under the Operation of the Pre-Vacuum Pump System of the Steam Sterilizer”. Journal of Health Promotion and Environmental Health Research Health Promotion Centre 8 Udon Thani 2 (4). Udon Thani,Thailand:52-62. https://he04.tci-thaijo.org/index.php/hpc8Journal/article/view/1254.