Toselli, Bruno, and Nadia Giaretta Biase. 2024. “Time Series Analysis: A Study of the Stock Exchange Investment Portfolio of the Companies Petrobras, Banco Do Brasil, Vale and Ambev”. Sigmae 13 (5):40-57. https://publicacoes.unifal-mg.edu.br/revistas/index.php/sigmae/article/view/2464.