VER HOEF, J.; PETERSON, E.; CLIFFORD, D.; SHAH, R. SSN: An R Package for Spatial Statistical Modeling on Stream Networks. Journal of Statistical Software, [S. l.], v. 56, n. 3, p. 1–45, 2014. DOI: 10.18637/jss.v056.i03. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v056i03. Acesso em: 15 aug. 2022.