Darwanto, D., P. B. Santosa, H. R. Handayani, J. Aminata, F. Arianti, and I. Gozhali. “Does Formal Constraints Reduce CO2 Emissions? Indonesia’s Empirical Case”. International Journal of Energy Economics and Policy, vol. 10, no. 1, Nov. 2019, pp. 236-41, https://econjournals.com/index.php/ijeep/article/view/8510.