Jiarpinitnun, J., Thongsukh, V., Trongtokit, K. and Kochasan, J. (2014) “The Invention of Anesthetic Gas Return Connector for Anesthetic Machine”, Research Medical Journal, 37(1), pp. 2–8. available at: https://he02.tci-thaijo.org/index.php/ramajournal/article/view/95269 (accessed: 20 September 2026).