FERNÁNDEZ-DURÁN, J. J.; GREGORIO-DOMÍNGUEZ, M. M. CircNNTSR: An R Package for the Statistical Analysis of Circular, Multivariate Circular, and Spherical Data Using Nonnegative Trigonometric Sums. Journal of Statistical Software, [S. l.], v. 70, n. 6, p. 1–19, 2016. DOI: 10.18637/jss.v070.i06. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v070i06. Acesso em: 30 jun. 2024.