WELLER, Z. D. spTest: An R Package Implementing Nonparametric Tests of Isotropy. Journal of Statistical Software, [S. l.], v. 83, n. 4, p. 1–24, 2018. DOI: 10.18637/jss.v083.i04. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v083i04. Acesso em: 27 apr. 2024.