Forecasting stock market volatility using GARCH models: A comparative study of the U.S. and Saudi markets . The Economics and Finance Letters, [S. l.], v. 13, n. 1, p. 132–150, 2026. DOI: 10.18488/29.v13i1.4816. Disponível em: https://archive.conscientiabeam.com/index.php/29/article/view/4816. Acesso em: 19 aug. 2026.