PAYTON, Q. C.; MCMANUS, M. G.; WEBER, M. H.; OLSEN, A. R.; KINCAID, T. M. micromap: A Package for Linked Micromaps. Journal of Statistical Software, [S. l.], v. 63, n. 2, p. 1–16, 2015. DOI: 10.18637/jss.v063.i02. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v063i02. Acesso em: 28 may. 2022.