Sania Ashraf. P.P1 and Malabika Deo (2013) “MODELLING CONDITIONAL VOLATILITY IN SHARIAH INDEX OF GCC COUNTRIES”, Singaporean Journal of Business Economics and Management, 2((4), pp. 22–31. Available at: http://singaporeanjbem.com/index.php/SJBEM/article/view/130 (Accessed: 18 April 2026).