GUESMI, K.; TEULON, F.; FTITI, Z. Sudden Changes In Volatility In European Stock Markets. Journal of Applied Business Research (JABR), [S. l.], v. 30, n. 6, p. 1567–1576, 2014. DOI: 10.19030/jabr.v30i6.8872. Disponível em: https://clutejournals.com/index.php/JABR/article/view/8872. Acesso em: 30 jan. 2023.