N. H. Abd Manaf and I. Ismail, “Volatility Estimation Of Islamic and Conventional Stock Prices Using GARCH Method”, EKST, vol. 2, no. 1, pp. 261–269, Aug. 2022, Accessed: Jul. 18, 2024. [Online]. Available: https://publisher.uthm.edu.my/periodicals/index.php/ekst/article/view/5411