IACUS, S.; KING, G.; PORRO, G. . cem: Software for Coarsened Exact Matching. Journal of Statistical Software, [S. l.], v. 30, n. 9, p. 1–27, 2009. DOI: 10.18637/jss.v030.i09. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v030i09. Acesso em: 24 jul. 2024.