RIGDON, J.; BAIOCCHI, M.; BASU, S. Near-Far Matching in R: The nearfar Package. Journal of Statistical Software, Code Snippets, [S. l.], v. 86, n. 5, p. 1–21, 2018. DOI: 10.18637/jss.v086.c05. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v086c05. Acesso em: 4 dec. 2021.