Coupling a Bat Algorithm with XGBoost to Estimate Reference Evapotranspiration in the Arid and Semiarid Regions of China - Zeng, Wenzhi; Huang, Guomin; Pan, Yanxin; Zhai, Bingnian; Wu, Jianping; Han, Yixiu; Wu, Lifeng (Advances in meteorology, 2019)