Tangphant, K., C. Phupha, K. Sudaprasert, and S. Sudaparsert. “Improving the Gas Productivity of the Alkaline Electrolyzer through the Circulation Technique”. Engineering and Applied Science Research, vol. 41, no. 1, Sept. 2014, pp. 13-18, https://ph01.tci-thaijo.org/index.php/easr/article/view/21757.