Kharisudin I, Oktaviani NY. Optimizing deep learning techniques with stacking BiLSTM and BiGRU models for gold price prediction. IAPGOS [Internet]. 2025 Sep. 30 [cited 2025 Dec. 16];15(3):123-30. Available from: https://ph.pollub.pl/index.php/iapgos/article/view/6955