OLIVEIRA, María; CRUJEIRAS, Rosa M.; RODRÍGUEZ-CASAL, Alberto. NPCirc: An R Package for Nonparametric Circular Methods. Journal of Statistical Software, [S. l.], v. 61, n. 9, p. 1–26, 2014. DOI: 10.18637/jss.v061.i09. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v061i09. Acesso em: 15 apr. 2025.