LIBĂ‚NIO, G. Unit roots in macroeconomic time series: theory, implications, and evidence. Nova Economia, [S. l.], v. 15, n. 3, 2009. DisponĂ­vel em: https://revistas.face.ufmg.br/index.php/novaeconomia/article/view/461. Acesso em: 29 nov. 2020.