YAN, J. Enjoy the Joy of Copulas: With a Package copula. Journal of Statistical Software, [S. l.], v. 21, n. 4, p. 1–21, 2007. DOI: 10.18637/jss.v021.i04. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v021i04. Acesso em: 15 aug. 2022.