Phrakhruopatnontakitti, Phrakhruopatnontakitti, Busakorn Watthanabut, and Kittisak Jermsittiparsert. 2020. “Does CO2 Emission Have Any Link With the Change Democratic Conditions in ASEAN Countries?”. International Journal of Energy Economics and Policy 10 (3):196-203. https://econjournals.com/index.php/ijeep/article/view/9169.