Sultan, Z. A., T. T. Yousef Alkhateeb, and A. H. Adow. “Verifying the Environmental Kuznets Curve Hypothesis in the Case of India”. International Journal of Energy Economics and Policy, vol. 11, no. 2, Feb. 2021, pp. 127-32, https://www.econjournals.com/index.php/ijeep/article/view/10392.