MODELLING CONDITIONAL VOLATILITY IN SHARIAH INDEX OF GCC COUNTRIES. Singaporean Journal of Business Economics and Management, [S. l.], v. 2, n. (4), p. 22–31, 2013. Disponível em: https://www.singaporeanjbem.com/index.php/SJBEM/article/view/130. Acesso em: 16 jul. 2026.