Vilaysouk, L., and P. Pornprasert. “Appropriate Performance Indicators Determining for Service Center Division of Electricite Du Laos in Salavan Province, Laos PDR”. Thai Industrial Engineering Network Journal, vol. 5, no. 1, June 2019, pp. 14-20, https://ph02.tci-thaijo.org/index.php/ienj/article/view/197820.