Spectral Analysis of Long Memory in Financial Volatility Dynamics: Evidence from the CAC 40 Stock Market Index. Mathematical Applications and Statistical Rigor (MASR), [S. l.], v. 1, n. 2, p. 107–126, 2026. Disponível em: https://pub.scientificirg.com/index.php/MASR/article/view/108. Acesso em: 9 apr. 2026.