CARDINALI, A.; NASON, G. P. Costationarity of Locally Stationary Time Series Using costat. Journal of Statistical Software, [S. l.], v. 55, n. 1, p. 1–22, 2013. DOI: 10.18637/jss.v055.i01. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v055i01. Acesso em: 26 nov. 2022.