OMAY, R. E. The Relationship between Environment and Income: Regression Spline Approach. International Journal of Energy Economics and Policy, [S. l.], v. 3, n. S, p. 52–61, 2013. Disponível em: https://www.econjournals.com/index.php/ijeep/article/view/575. Acesso em: 27 apr. 2024.