Hidayana, Rizki Apriva, Herlina Napitupulu, and Sukono Sukono. 2021. “Determination of Value-at-Risk in UNVR Stocks Using ARIMA-GJR-GA RCH Model”. Operations Research: International Conference Series 2 (4):89-92. https://doi.org/10.47194/orics.v2i4.181.