Ihsan, M., Zahnur, Fadlan, I. ., & Ikhsan Maulidi. (2026). Hybrid random forest–catboost ensemble for heart disease prediction on imbalanced datasets: Toward applications in military health systems. International Journal of Applied Mathematics, Sciences, and Technology for National Defense, 4(1), 71-82. https://doi.org/10.58524/app.sci.def.v4i1.1148