Tantanatewin, Wattana, Ammara Leesan, and Sunchai Theerapongpakdee. 2013. “Comparison of coaxial circle circuit with carbon dioxide absorber and coaxial D circuit without carbon dioxide absorber in general anesthesia”. Srinagarind Medical Journal 11 (3):107-12. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/13881.