D. C. Kho, H. D. Purnomo, and H. Hendry, “PERFORMANCE ANALYSIS OF GRADIENT BOOSTING MODELS VARIANTS IN PREDICTING THE DIRECTION OF STOCK CLOSING PRICES ON THE INDONESIA STOCK EXCHANGE”, BAREKENG: J. Math. & App., vol. 19, no. 2, pp. 1393-1408, Apr. 2025.