Zambrano-Monserrate, Manuel A., et al. “Relationship Between Economic Growth and Environmental Degradation: Is There Evidence of an Environmental Kuznets Curve for Brazil?”. International Journal of Energy Economics and Policy, vol. 6, no. 2, Apr. 2016, pp. 208-16, https://mail.econjournals.com/index.php/ijeep/article/view/1850.