F. . Malik, S. N. . Sabir, A. U. . Rahman, and A. . Khalid, “Integrating XGBoost and Recurrent Neural Networks (RNNs) to Optimize COVID-19 Mortality Prediction”, Iraqi Journal of Science, vol. 66, no. 10, pp. 4590–4613, Oct. 2025, doi: 10.24996/ijs.2025.66.10.41.