USORO, A. E. On the Stationarity of Multivariate Time Series. Benin Journal of Statistics, [S. l.], v. 3, n. 1, p. 160– 169, 2020. Disponível em: https://www.bjs-uniben.org/index.php/home/article/view/29. Acesso em: 16 dec. 2025.