Kisti, Vuji Annisa, Fadiah Hasna Nadiatul Haq, and Rizki Apriva Hidayana. 2024. “Implementing the Variance-Covariance Method for Assessing Market Transaction Risks in Raw Material Sector Stocks”. Operations Research: International Conference Series 5 (2):56-61. https://doi.org/10.47194/orics.v5i2.310.