VAN DER WAL, W. M.; GESKUS, R. B. ipw: An R Package for Inverse Probability Weighting. Journal of Statistical Software, [S. l.], v. 43, n. 13, p. 1–23, 2011. DOI: 10.18637/jss.v043.i13. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v043i13. Acesso em: 4 jul. 2022.