CROISSANT, Y.; MILLO, G. Panel Data Econometrics in R: The plm Package. Journal of Statistical Software, [S. l.], v. 27, n. 2, p. 1–43, 2008. DOI: 10.18637/jss.v027.i02. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v027i02. Acesso em: 24 nov. 2024.