Asri Rahmawati, Retno Budiarti, and Hadi Sumarno, “Determination of Stock Investment Risk Using the Multivariate Time Series Approach”, IJSBAR, vol. 67, no. 1, pp. 76–88, Jan. 2023, Accessed: Sep. 13, 2025. [Online]. Available: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/15161