Gunanto, Edy Yusuf Agung, et al. “Convergence CO2 Emission in ASEAN Countries: Augmented Green Solow Model Approach”. International Journal of Energy Economics and Policy, vol. 11, no. 5, Aug. 2021, pp. 572-8, https://econjournals.org.tr/index.php/ijeep/article/view/11582.