Kwon, Wonok. “Design and Modeling of Highly Power efficient Node-level DC UPS”. ECTI Transactions on Computer and Information Technology (ECTI-CIT) 7, no. 1 (April 6, 2016): 59–62. accessed January 6, 2026. https://ph01.tci-thaijo.org/index.php/ecticit/article/view/54353.