Torasa, Chonmapat, and Witthaya Mekhum. “Analyzing the Impact of Energy Imports, Fuel Substitution and Technological Change on Real GDP: A Panel Data Study of ASEAN Countries”. International Journal of Energy Economics and Policy, vol. 10, no. 6, Oct. 2020, pp. 559-65, https://econjournals.com./index.php/ijeep/article/view/10453.