LAWAL, A. I.; BABAJIDE, A. A.; NWANJI, T. I.; ELUYELA, D. Are Oil Prices Mean Reverting? Evidence from Unit Root Tests with Sharp and Smooth Breaks. International Journal of Energy Economics and Policy, [S. l.], v. 8, n. 6, p. 292–298, 2018. Disponível em: https://www.econjournals.com/index.php/ijeep/article/view/6980. Acesso em: 29 mar. 2024.