DUMELLE, M.; KINCAID, T.; OLSEN, A. R.; WEBER, M. spsurvey: Spatial Sampling Design and Analysis in R. Journal of Statistical Software, [S. l.], v. 105, n. 1, p. 1–29, 2023. DOI: 10.18637/jss.v105.i03. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v105i03. Acesso em: 5 feb. 2023.