Ramdhan, W. ., J. Hutahaean, D. Jollyta, and A. Karim. “Machine Learning Decision Support System for Heart Disease Prediction With Optuna and Threshold Optimization”. Jurnal Teknik Informatika (Jutif), vol. 7, no. 2, Apr. 2026, pp. 1853-70, doi:10.52436/1.jutif.2026.7.2.5684.