A. A. S. Abdul Rahim Ponniah and Shuhaida Ismail, “The Effect of Heteroscedasticity in Apple Stock Price Towards Predicting its Future Value”, EKST, vol. 4, no. 2, pp. 306–316, Dec. 2024, Accessed: Aug. 15, 2026. [Online]. Available: https://periodical.uthm.edu.my/index.php/ekst/article/view/14424