A novel hybrid modeling approach based on empirical methods, PSO, XGBoost, and multiple GCMs for forecasting long-term reference evapotranspiration in a data scarce-area. - Ali el Bilali; Abdessamad Hadri; Abdeslam Taleb; Meryem Tanarhte; El Mahdi El Mhamdi; Mohamed Hakim Kharrou (Comput. Electron. Agric., 2025)